converse.js/sass/_core.scss

@mixin fade-in {
    opacity: 0;  /* make things invisible upon start */
    @include animation-name(fadein);
    @include animation-fill-mode(forwards);
    @include animation-duration(0.75s);
    @include animation-timing-function(ease);
}

body.converse-fullscreen {
    margin: 0;
    background-color: var(--global-background-color);
}

#conversejs-bg {
    .converse-brand {
        display: flex;
        justify-content: space-between;
        margin-top: 15vh;
        @include animation-name(fadein);
        @include animation-fill-mode(forwards);
        @include animation-duration(5s);
        @include animation-timing-function(ease);
    }

    .converse-brand__padding {
        @include make-col-ready();
        @include media-breakpoint-up(md) {
            @include make-col(4);
        }
        @include media-breakpoint-up(lg) {
            @include make-col(3);
        }
        @include media-breakpoint-up(xl) {
            @include make-col(2);
        }
        padding: 0;
    }

    .converse-brand__heading {
        @include make-col-ready();
        @include media-breakpoint-up(md) {
            font-size: 4em;
            @include make-col(8);
        }
        @include media-breakpoint-up(lg) {
            font-size: 5em;
            @include make-col(9);
        }
        @include media-breakpoint-up(xl) {
            font-size: 6em;
            @include make-col(10);
        }
        padding: 0;
        display: flex;
        justify-content: center;
        margin: auto;
        svg {
            margin-top: 0.3em;
        }
    }

    .converse-brand__text {
        color: #ffffff;
        font-family: var(--branding-font);
        font-weight: normal;
        text-align: center;
        font-size: 140%;
        margin-left: 0.2em;
        .byline {
            margin: 0;
            font-family: var(--heading-font);
            font-size: 0.3em;
            opacity: 0.55;
            margin-bottom: 2em;
            margin-left: -2.7em;
            word-spacing: 5px;
        }
    }
}

#conversejs-bg, #conversejs {
    .subdued {
        opacity: 0.35;
    }
}

#conversejs {
    bottom: 0;
    height: 100%;
    position: fixed;
    padding-left: env(safe-area-inset-left);
    padding-right: env(safe-area-inset-right);
    color: var(--text-color);
    font-family: var(--normal-font);
    font-size: var(--font-size);
    direction: ltr;
    z-index: 1031; // One more than bootstrap navbar

    textarea:disabled {
        background-color: #EEE !important;
    }

    .nopadding {
        padding: 0 !important;
    }

    &.converse-overlayed {
        > .row {
            flex-direction: row-reverse;
        }
    }

    &.converse-fullscreen,
    &.converse-mobile {
        .converse-chatboxes {
            width: 100vw;
            left: -15px; // Hack due to padding added by bootstrap
        }
    }
    &.converse-overlayed {
        height: 3em;
    }

    .brand-heading-container {
        text-align: center;
    }

    .brand-heading {
        display: inline-flex;
        flex-direction: row;
        align-items: flex-start;
        font-family: var(--branding-font);
        color: var(--link-color);
        margin-bottom: 1em;

        .brand-name {
            color: var(--link-color);
            display: flex;
            flex-direction: column;
            align-items: center;
            margin-top: -0.5em;
        }

        .brand-name__text {
            font-size: 120%;
            vertical-align: text-bottom;
        }

        .converse-svg-logo {
            color: var(--link-color);
            height: 1.5em;
            margin-right: 0.25em;
            margin-bottom: -0.25em;
            .cls-1 {
                isolation: isolate;
            }
            .cls-2 {
                opacity: 0.5;
                mix-blend-mode: multiply;
            }
            .cls-3 {
                fill: var(--link-color);
            }
            .cls-4 {
                fill: var(--link-color);
            }
        }
    }

    .brand-heading--inverse {
        .converse-svg-logo {
            margin-bottom: 0em;
            margin-top: -0.2em;
        }
        .byline {
            margin: 0;
            font-family: var(--heading-font);
            font-size: 0.25em;
            opacity: 0.55;
            margin-left: -7em;
            word-spacing: 5px;
        }
    }

    .popover {
        position: fixed;
    }

    .converse-chatboxes {
        z-index: 1031; // One more than bootstrap navbar
        position: fixed;
        bottom: 0;
        right: 0;
    }

    ::-webkit-input-placeholder { /* Chrome/Opera/Safari */
        color: var(--subdued-color);
    }
    ::-moz-placeholder { /* Firefox 19+ */
        color: var(--subdued-color);
    }
    :-ms-input-placeholder { /* IE 10+ */
        color: var(--subdued-color);
    }
    :-moz-placeholder { /* Firefox 18- */
        color: var(--subdued-color);
    }
    ::placeholder {
        color: var(--subdued-color);
    }

    ::selection {
        background-color: var(--highlight-color);
    }
    ::-moz-selection {
        background-color: var(--highlight-color);
    }

    @media screen and (max-width: $mobile-portrait-length) {
        margin: 0;
        right: 10px;
        left: 10px;
        bottom: 5px;
    }
    @media screen and (max-height: $mobile-landscape-height) {
        margin: 0;
        right: 10px;
        left: 10px;
        bottom: 5px;
    }

    ul li { height: auto; }
    div, span, h1, h2, h3, h4, h5, h6, p, blockquote,
    pre, a, em, img, strong, dl, dt, dd, ol, ul, li,
    fieldset, form, legend, table, caption, tbody,
    tfoot, thead, tr, th, td, article, aside, details,
    embed, figure, figcaption, footer, header, hgroup, menu,
    nav, output, ruby, section, summary, time, mark, audio, video {
        margin: 0;
        padding: 0;
        border: 0;
        font: inherit;
        vertical-align: baseline;
    }

    textarea,
    input[type=submit], input[type=button],
    input[type=text], input[type=password],
    button {
        font-size: var(--font-size);
        padding: 0.25em;
        min-height: 0;
    }

    strong {
        font-weight: 700;
    }

    em {
        font-style: italic;
    }

    ol, ul {
        list-style: none;
    }

    li {
        height: 10px;
    }

    ul, ol, dl {
        font: inherit;
        margin: 0;
    }

    a, a:visited, a:not([href]):not([tabindex]) {
        text-decoration: none;
        color: var(--link-color);
        text-shadow: none;
        &:hover {
            color: var(--link-color-darken-20-percent);
            text-decoration: none;
            text-shadow: none;
        }

        &.fa, &.far, &.fas {
            color: var(--subdued-color);
            &:hover {
                color: var(--gray-color);
            }
        }
    }

    svg {
        border-radius: var(--chatbox-border-radius);
    }

    .fa, .far, .fas {
        color: var(--subdued-color);
    }

    .fa:hover, .far:hover, .fas:hover {
        color: var(--gray-color);
    }

    .modal {
        background-color: rgba(0, 0, 0, 0.4);

        .modal-body {
            p {
                padding: 0.25rem 0;
            }
        }

        .modal-footer {
            justify-content: flex-start;
        }
    }

    .selected {
        color: var(--link-color) !important;
    }

    .circle {
        border-radius: 50%;
    }

    .badge {
        line-height: 1;
        font-weight: normal;
        font-size: 90%;
    }

    .btn {
        font-weight: normal;
        color: #fff;
        .fa, .far, .fas {
            color: #fff;
            margin-right: 0.5em;
        }
    }

    .no-text-select {
        -webkit-touch-callout: none;
        @include user-select(none);
    }

    @keyframes colorchange-chatmessage {
        0%   {background-color: rgba(141, 216, 174, 1);}
        25%  {background-color: rgba(141, 216, 174, 0.75);}
        50%  {background-color: rgba(141, 216, 174, 0.5);}
        75%  {background-color: rgba(141, 216, 174, 0.25);}
        100% {background-color: transparent;}
    }
    @-webkit-keyframes colorchange-chatmessage {
        0%   {background-color: rgba(141, 216, 174, 1);}
        25%  {background-color: rgba(141, 216, 174, 0.75);}
        50%  {background-color: rgba(141, 216, 174, 0.5);}
        75%  {background-color: rgba(141, 216, 174, 0.25);}
        100% {background-color: transparent;}
    }

    @keyframes colorchange-chatmessage-muc {
        0%   {background-color: rgba(255, 181, 162, 1);}
        25%  {background-color: rgba(255, 181, 162, 0.75);}
        50%  {background-color: rgba(255, 181, 162, 0.5);}
        75%  {background-color: rgba(255, 181, 162, 0.25);}
        100% {background-color: transparent;}
    }
    @-webkit-keyframes colorchange-chatmessage-muc {
        0%   {background-color: rgba(255, 181, 162, 1);}
        25%  {background-color: rgba(255, 181, 162, 0.75);}
        50%  {background-color: rgba(255, 181, 162, 0.5);}
        75%  {background-color: rgba(255, 181, 162, 0.25);}
        100% {background-color: transparent;}
    }


    @keyframes fadein {
        0% { opacity: 0 }
        100% { opacity: 1 }
    }
    @-webkit-keyframes fadein {
        0% { opacity: 0 }
        100% { opacity: 1 }
    }

    @-webkit-keyframes fadeOut {
		 0% { opacity: 1; visibility: visible; }
		 100% { opacity: 0; visibility: hidden;  }
	} 
    @keyframes fadeOut {
		 0% { opacity: 1; visibility: visible; }
		 100% { opacity: 0; visibility: hidden;  }
	} 

    .fade-in {
        @include fade-in;
    }

    .visible {
        opacity:0;  /* make things invisible upon start */
        @include animation-name(fadein);
        @include animation-fill-mode(forwards);
        @include animation-duration(500ms);
        @include animation-timing-function(ease);
    }

    .hidden {
        opacity: 0 !important;
        display: none !important;
    }

    .fade-out {
		animation-duration: 1s;
		animation-fill-mode: forwards;  
		animation-name: fadeOut;
		animation-timing-function: ease-in-out;
    }

    .collapsed {
        height: 0 !important;
        overflow: hidden !important;
        padding: 0 !important;
    }

    .locked {
        padding-right: 22px;
    }


    @include keyframes(spin) {
        from {
            @include transform(rotate(0deg));
        }
        to {
            @include transform(rotate(359deg));
        }
    }

    .spinner {
        @include animation(spin 2s infinite, linear);
        width: 1em;
        display: block;
        text-align: center;
        margin: 2em;
        font-size: 24px;
    }
    .left {
        float: left;
    }
    .right {
        float: right;
    }
    .centered {
        text-align: center;
        display: block;
        margin: auto;
    }
    .hor_centered {
        text-align: center;
        display: block;
        margin: 0 auto;
        clear: both;
    }

    .error {
        color: var(--error-color);
    }
    .info {
        color: var(--info-color);
    }
    .reg-feedback {
        font-size: 85%;
        margin-bottom: 1em;
    }

    .reg-feedback,
    #converse-login .conn-feedback {
        display: block;
        text-align: center;
        width: 100%;
    }

    .avatar {
        border-radius: var(--avatar-border-radius);
        border: var(--avatar-border);
        background-color: var(--avatar-background-color);
    }

    .activated {
        display: block !important;
    }

    .nav-pills .nav-link.active,
    .nav-pills .show > .nav-link {
        background-color: var(--primary-color);
    }

    .list-group-item.active {
        background-color: var(--primary-color);
        border-color: var(--primary-color-dark);
    }

    .badge {
        text-shadow: none;
        color: white;
    }

    .badge-light {
        color: var(--text-color);
    }

    .btn-primary, .button-primary, .badge-primary {
        background-color: var(--primary-color);
        border-color: transparent;
        &:hover {
            background-color: var(--primary-color-dark);
            border-color: transparent;
        }
        &.active {
            background-color: var(--primary-color-dark) !important;
            border-color: transparent !important;
        }
    }

    .badge-groupchat {
        background-color: var(--chatroom-badge-color);
        border-color: transparent;
        &:hover {
            background-color: var(--chatroom-badge-hover-color);
            border-color: transparent;
        }
        &.active {
            background-color: var(--chatroom-badge-hover-color) !important;
            border-color: transparent !important;
        }
    }

    .btn-info, .badge-info {
        background-color: var(--primary-color);
        border-color: var(--primary-color);
        &:hover {
            background-color: var(--primary-color-dark);
            border-color: var(--primary-color-dark);
        }
    }

    .button-cancel,
    .btn-secondary, .badge-secondary {
        color: white;
        background-color: var(--secondary-color);
        border-color: var(--secondary-color);
        &:hover {
            background-color: var(--secondary-color-dark);
            border-color: var(--secondary-color-dark);
        }
    }

    .btn-warning {
        color: white;
        background-color: var(--warning-color);
        border-color: var(--warning-color);
        &:hover {
            color: white;
            background-color: var(--warning-color-dark);
            border-color: var(--warning-color-dark)
        }
    }

    .btn-danger {
        color: white;
        background-color: var(--danger-color);
        border-color: var(--danger-color) !important;
        &:hover {
            background-color: var(--danger-color-dark);
            border-color: var(--danger-color-dark);
        }
    }
}

@media screen and (max-width: 575px) {
    body {
      .converse-brand {
        font-size: 3.75em;
      }
    }
    #conversejs:not(.converse-embedded)  {
        .chatbox  {
            .chat-body {
                border-radius: var(--chatbox-border-radius);
            }
        }
        .flyout {
            border-radius: var(--chatbox-border-radius);
        }
    }
}


@media screen and (min-width: 576px) {
    #conversejs .offset-sm-2 {
        margin-left: 16.666667%;
    }
}
@media screen and (min-width: 768px) {
    #conversejs .offset-md-2 {
        margin-left: 16.666667%;
    }
    #conversejs .offset-md-3 {
        margin-left: 25%;
    }
}
@media screen and (min-width: 992px) {
    #conversejs .offset-lg-2 {
        margin-left: 16.666667%;
    }
    #conversejs .offset-lg-3 {
        margin-left: 25%;
    }
}
@media screen and (min-width: 1200px) {
    #conversejs .offset-xl-2 {
        margin-left: 16.666667%;
    }
}
@media screen and (max-height: 450px) {
  #conversejs {
    left: 0;
  }
}