zulip/static/styles/reactions.css

.message_reactions {
    padding-left: 46px;
    overflow: hidden;
}

.message_reactions .message_reaction {
    float: left;
    margin: 0.15em;
    padding: 0 2px 0 0;
    height: 19px;
    cursor: pointer;
    background-color: #ffffff;
    border: 1px solid #c7dfe6;
    border-radius: 4px;
}

.private-message .message_reactions .message_reaction {
    /* Use the PM color background, since white-on-yellow looks bad. */
    background-color: #feffe0;
}

.message_reactions .reacted {
    /* Needs to be important to override the .private-message one */
    background-color: #eef7fa !important;
}

.message_reactions .message_reaction .emoji {
    display: inline-block;
    vertical-align: top;
    top: -3px;
    margin: 0px;

    transform: scale(0.70);
    transform-origin: 50% 50%;
    -moz-transform: scale(0.70);
    -moz-transform-origin: 50% 50%;
}

.message_reactions .message_reaction_count {
    position: relative;
    top: 4px;
    font-size: 0.8em;
    display: inline-block;
    vertical-align: top;
    color: #0088CC;
    margin: 0px 1px 0px 0px;
    line-height: 1em;
}

.message_reactions .reaction_button .message_reaction_count {
    top: 0.5px;
}

.message_reactions i {
    font-size: 1.3em;
    float: left;
    color: #555;
}

.message_reactions .reaction_button:not(:only-child) {
    margin-bottom: 5px;
}

.message_reactions:hover .message_reaction + .reaction_button {
    visibility: visible;
    pointer-events: all;
    background-color: #fafafa;
    color: #bbb;
}

.message_reactions .reaction_button i {
    font-size: 1em;
    margin-right: 3px;
}

.message_reactions .reaction_button:hover i {
    color: #0088CC;
}

.message_reactions .message_reaction:hover {
    border: thin solid #0088CC;
}

.message_reactions .reaction_button:only-child {
    display: none;
}

.message_reactions .message_reaction + .reaction_button {
    visibility: hidden;
    pointer-events: none;
    margin: 2px 0.1em 3px 0.1em;
    padding: 3px;
    height: 14px;
    border-radius: 4px;
    padding-left: 0.3em;
    border: thin solid #bbb;
    padding-right: 0.3em;
    float: left;
}

.message_reactions .reaction_button:hover {
    border: thin solid #0088CC;
    background-color: #eef7fa;
    cursor: pointer;
    opacity: 1.0;
    color: #0088CC;
}

.message_reactions .reaction_button .message_reaction_count {
    font-size: 1.1em;
    color: #555;
    margin-left: 3px;
}

.message_reactions .reaction_button:hover .message_reaction_count {
    color: #0088CC;
}

.reaction-popover {
    display: inline-block;
    width: 231px;
}

.reaction-popover-top {
    padding-bottom: 0;
}

.reaction-popover-top .icon-vector-search {
    display: inline-block;
    vertical-align: top;
    padding: 8px;
    color: #bbb;
    cursor: pointer;
}

.reaction-popover-filter {
    width: calc(100% - 48px);
    margin: auto;
    padding-left: 3em;
}

.reaction-popover-emoji-map {
    margin: 0;
    padding: 0.5em 0;
    overflow: hidden;
    overflow-y: auto;
    display: inline-block;
    height: 16.5em;
}

.reaction-popover-reaction {
    float: left;
    margin: 0.1em;
    padding: 0.3em;
    cursor: pointer;
    border: thin solid white;
    border-radius: 0.5em;
}

.reaction-popover .reacted {
    background-color: #eef7fa;
    border-color: #add8e6;
}