zulip/static/styles/media.css

.screen-medium-show,
.screen-narrow-show {
    display: none !important;
}

/* This max-width must be synced with viewport.is_narrow */
@media (max-width: 975px) {

    .screen-full-show {
        display: none !important;
    }

    .screen-medium-show {
        display: block !important;
    }

    .app-main,
    .header-main {
        min-width: 750px;
    }

    .column-right {
        display: none;
    }

    .column-right.expanded {
        display: block;
        position: absolute;
        float: none;
        right: 15px;
        top: 0px;
    }

    .column-right.expanded .right-sidebar {
        background: rgba(255,255,255,0.9);
        box-shadow: 0px -2px 3px 0px rgba(0,0,0,0.1);
        border-left: 1px solid #dddddd;
        margin-top: 40px;
        padding-top: 10px;
        height: 100%;
    }

    .header-main .column-right {
        display: inline-block;
        width: 30px;
    }


    #top_navbar.rightside-userlist .navbar-search {
        margin-right: 100px;
    }

    #top_navbar.rightside-userlist #navbar-buttons {
        margin-right: 41px;
    }

    .navbar-search {
        margin-right: 60px;
    }


    #userlist-toggle {
        display: block;
    }

    .compose-content {
        margin-right: 7px;
    }

    .nav .dropdown-menu {
        min-width: 180px;
        -webkit-box-shadow: 0px 0px 5px rgba(0, 0, 0, 0.2);
        -moz-box-shadow: 0px 0px 5px rgba(0, 0, 0, 0.2);
        box-shadow: 0px 0px 5px rgba(0, 0, 0, 0.2);
    }

    .nav .dropdown-menu:after {
        right: 10px;
    }

    .column-middle {
        margin-right: 7px;
    }

    #subscriptions-status {
        left: 300px;
        right: 50px;
    }

}

@media (max-width: 775px) {

    body {
       padding: 0px;
    }

    .screen-narrow-show {
        display: inline-block !important;
    }

    .column-left {
        display: none;
    }

    .column-left.expanded {
        display: block;
        position: absolute;
        float: none;
        left: 0px;
        top: 0px;
    }

    .column-left.expanded .left-sidebar {
        background: rgba(255,255,255,0.9);
        box-shadow: 0px 2px 3px 0px rgba(0,0,0,0.1);
        border-right: 1px solid #dddddd;
        margin-top: 40px;
        padding-top: 10px;
        height: 100%;
        padding-left: 10px;
        width: 250px;
    }

    body, html,
    .app-main,
    .header-main {
        min-width: 350px;
    }

    .column-middle,
    .app-main .column-middle {
        margin-left:  7px;
        margin-right: 7px;
    }

    .header-main .column-middle {
        margin-left: 0px;
    }

    .column-middle-inner {
        margin-left:  0px;
        margin-right: 15px;
    }

    .app-main .column-middle .column-middle-inner {
        margin-right: 0px;
    }

    .skinny-user-gravatar {
        position: absolute;
        top: 0px;
    }

    #streamlist-toggle {
        display: block;
    }

    .compose-content {
        margin-right: 7px;
        margin-left: 7px;
    }

    #searchbox {
        margin-left: 42px;
    }

    #top_navbar.rightside-userlist .navbar-search {
        margin-right: 127px;
    }

    .navbar-search {
        margin-right: 81px;
    }

    #subscriptions-status {
        left: 35px;
    }

}

@media (max-width: 500px) {
    .compose_stream_button_label,
    .compose_private_button_label {
        display: none;
    }

    .stream-name {
        max-width: 120px;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }
}

@media (max-width: 350px) {
    html {
        overflow-x: hidden;
    }
    .stream_row .description {
        display: none;
    }
}

@media (max-width: 500px) {
    .compose_stream_button,
    .compose_private_button {
        padding: 5px 10px 5px 10px;
    }

    #streamlist-toggle,
    #userlist-toggle,
    #navbar-buttons,
    .navbar-search,
    #tab_bar,
    #searchbox,
    #search_query,
    #tab_list li,
    #tab_list,
    .header {
        height: 30px;
        line-height: 30px;
    }

    #streamlist-toggle-button,
    #userlist-toggle-button {
        height: 30px;
        padding-top: 0px;
        padding-bottom: 0px;
    }

    #navbar-buttons ul.nav .dropdown-toggle,
    #navbar-buttons ul.nav li.active .dropdown-toggle {
        top: -5px;
    }

    #top_navbar.rightside-userlist .navbar-search {
        margin-right: 115px;
    }

    #searchbox .input-append .icon-vector-search {
        top: 5px;
    }

    #searchbox .search_button, #searchbox .search_button[disabled]:hover {
        top: 2px;
    }

    #tab_bar_underpadding {
        top: 30px;
    }

    .messagebox-content {
        padding-right: 15px;
    }

    .message_time {
        right: auto;
        left: -3px;
    }

    .message_controls {
        width: 56px;
        right: -10px;
        top: 0px;
    }

    .message_hovered .message_controls {
        z-index: 10;
    }

    .selected_message .message_controls {
        right: -10px;
    }

    .include-sender .message_controls {
        background: none !important;
        padding: none !important;
        border: none !important;
        top: -3px;
    }

    .include-sender .message_time {
        left: auto;
        right: -5px;
    }

    .include-sender .message_controls {
        right: 40px;
    }

    .sender_name {
        max-width: 250px;
        overflow: hidden;
        white-space: nowrap;
        text-overflow: ellipsis;
    }

    textarea.new_message_textarea {
        height: 30px !important;
        min-height: 30px !important;
    }

    #tab_bar_underpadding {
        height: 10px;
    }

    #floating_recipient_bar {
        top: 40px;
    }

    .message_content {
        padding-right: 50px;
    }

}

@media only screen and (min-device-width: 300px) and (max-device-width: 700px) {
    #unmute_muted_topic_notification {
        width: calc(90% - 30px);
        left: 5%;
        top: 5%;
    }
}