zulip/static/styles/input_pill.css

.pill-container {
    display: inline-block;

    padding: 2px;
    border: 1px solid hsla(0, 0%, 0%, 0.15);
    border-radius: 4px;

    font-size: 0.9em;

    cursor: text;
}

.pill-container .pill {
    position: relative;
    display: inline-block;

    padding: 0px 18px 0px 3px;
    margin: 1px 1px;

    color: hsl(177, 38%, 54%);
    border: 1px solid #b2e4e2;

    border-radius: 4px;

    cursor: pointer;
}

.pill-container .pill:focus {
    color: hsl(0, 38%, 54%);
    border: 1px solid #e4b2b2;

    outline: none;
}

.pill-container .input {
    display: inline-block;
    padding: 2px 4px;

    min-width: 2px;

    outline: none;
}

.pill-container .pill .exit {
    content: "\D7";
    position: absolute;
    top: 0px;
    right: 3px;

    opacity: 0.5;

    font-size: 1.3em;
}

.pill-container .pill:hover .exit {
    opacity: 1;
}

.pill-container .input.shake {
    animation: shake 0.3s cubic-bezier(.36,.07,.19,.97) both;
    transform: translate3d(0, 0, 0);
    backface-visibility: hidden;
    perspective: 1000px;
}

.pm_recipient .pill-container {
    position: relative;
    width: 100%;
    padding: 0px 2px;

    /* this is because the pills have a margin-bottom of 2px, so we want to negate
       the height of the bottom row. */
    margin: -1px 0px;

    border: none;
}

.pm_recipient .pill-container .pill {
    color: inherit;
    border: 1px solid hsla(0, 0%, 0%, 0.15);
    background: hsla(0, 0%, 0%, 0.07);
}

.pm_recipient .pill-container .pill:focus {
    color: #fff;
    border: 1px solid #108179;
    background: hsl(176, 49%, 42%);
}

.pm_recipient .pill-container .input {
    height: 20px;
}

.pm_recipient .pill-container .input:first-child:empty::before {
    content: attr(data-no-recipients-text);
    opacity: 0.5;
}

.pm_recipient .pill-container .pill + .input:focus:empty::before {
    content: attr(data-some-recipients-text);
    opacity: 0.5;
}

@keyframes shake {
    10%, 90% {
        transform: translate3d(-1px, 0, 0);
    }

    20%,
    80% {
        transform: translate3d(2px, 0, 0);
    }

    30%,
    50%,
    70% {
        transform: translate3d(-3px, 0, 0);
    }

    40%,
    60% {
        transform: translate3d(3px, 0, 0);
    }
}