zulip/static/styles/components.css

/* Reusable, object-oriented CSS base components for all Zulip pages
   (both webapp and portico). */

.new-style {
    label.checkbox {
        padding: 0;
        display: inline-block;
        position: relative;
        vertical-align: top;

        input[type="checkbox"] {
            position: absolute;
            clip: rect(0, 0, 0, 0);

            ~ span {
                display: inline-block;
                vertical-align: middle;
                position: relative;
                top: -2px;

                padding: 2px;
                margin: 0 5px 0 0;
                height: 10px;
                width: 10px;

                font-weight: 300;
                line-height: 0.8;
                font-size: 1.3rem;
                text-align: center;
                border: 1px solid hsla(0, 0%, 0%, 0.6);

                border-radius: 4px;
                filter: brightness(0.8);

                cursor: pointer;
            }

            &:checked ~ span {
                background-image: url(../images/checkbox.svg);
                background-size: 85%;
                background-position: 50% 50%;
                background-repeat: no-repeat;
            }

            &:focus ~ span {
                outline: 1px dotted;
                outline: -webkit-focus-ring-color auto 5px;
            }

            &:disabled ~ span {
                opacity: 0.5;
                cursor: not-allowed;
            }
        }
    }

    a.no-style {
        color: inherit;
    }
}

a.no-underline,
a.no-underline:hover {
    text-decoration: none;
}

.half-opacity {
    opacity: 0.5;
}

.italic {
    font-style: italic;
}

.simplebar-track {
    .simplebar-scrollbar::before {
        background-color: hsl(0, 0%, 0%);
        box-shadow: 0 0 0 1px hsla(0, 0%, 100%, 0.33);
    }

    &.simplebar-vertical {
        transition: width 0.2s ease 1s;

        &.simplebar-hover {
            width: 15px;
            transition: width 0.2s ease;
        }
    }

    &.simplebar-horizontal {
        transition: height 0.2s ease 1s;

        &.simplebar-hover {
            height: 15px;
            transition: height 0.2s ease;
        }

        .simplebar-scrollbar {
            transition: height 0.2s ease 1s;

            &.simplebar-hover {
                height: 11px;
                transition: height 0.2s ease;
            }
        }
    }
}

i.zulip-icon.bot {
    color: hsl(180, 5%, 74%);
    vertical-align: top;
    padding: 0 2px;
}

.tippy-content {
    /* This actually sets the
     * default font size of only
     * tooltips; popovers should define
     * font-size of their own.
     */
    font-size: 12px;
}