zulip/web/styles/informational_overlays.css

.informational-overlays {
    .overlay-content {
        width: var(--informational-overlay-max-width);
        margin: 0 auto;
        position: relative;
        top: calc((30vh - 50px) / 2);
        border-radius: 4px;
        overflow: hidden;

        background-color: var(--color-background-modal);
    }

    .overlay-tabs {
        padding: 10px 0;
        border-bottom: 1px solid hsl(0deg 0% 0% / 20%);

        .tab-switcher {
            margin-left: 15px;
        }

        .exit {
            float: right;
            font-size: 1.5rem;
            color: hsl(0deg 0% 67%);
            font-weight: 600;
            margin: 0 15px;
            cursor: pointer;
        }
    }

    .overlay-modal {
        padding-bottom: 10px;

        .overlay-scroll-container {
            height: 70vh;
            text-align: center;
            outline: none;

            .help-table {
                table-layout: fixed;
            }

            & th {
                font-weight: 400;
            }
        }
    }

    & td.operator {
        font-size: 0.9em;
    }

    .poll-question-header {
        display: inline;
    }
}

.hotkeys_table {
    table-layout: fixed;
    width: 100%;
    vertical-align: middle;
    display: table;

    & td.definition {
        /* keeps dividing line at same width for all tables in model. */
        width: calc(50% - 11px);
        text-align: right;
    }

    .hotkey {
        font-weight: normal;
    }

    .arrow-key {
        font-size: 1.36em;
        line-height: 1;
        padding: 0 0.2em 0.2em;
    }

    & th {
        width: 245px;
        text-align: center;
        /* aligns table name with dividing line */
    }

    & td:not(.definition) {
        text-align: left;
        white-space: normal;
        font-weight: bold;
    }
}

#keyboard-shortcuts table {
    margin-bottom: 10px !important;
}

@media only screen and (width < $md_min) {
    .informational-overlays {
        .overlay-content {
            width: calc(100% - 20px);
            /* Constrain to same width as in larger viewports. */
            max-width: var(--informational-overlay-max-width);
        }

        .tab-switcher {
            display: flex;

            &.large .ind-tab {
                width: 100%;
            }
        }

        .hotkeys_table {
            width: 100%;
            display: table;
        }
    }
}

#message-formatting-first-header,
#search-operators-first-header {
    width: 40%;
}