backup_backend.css

.serendipity_backup_form select {
    width: 100%;
}

.serendipity_backup_form fieldset {
    background: #eee;
    border: 1px solid #aaa;
    box-sizing: border-box;
    margin: 1em 0;
    padding: .5em 1em;
}

.serendipity_backup_form .form_buttons,
.serendipity_backups_wrap + .form_buttons,
.serendipity_backups {
    margin-top: 0;
}

.serendipity_backups_wrap {
    min-height: .01%;
    -ms-overflow-style: -ms-autohiding-scrollbar;
    overflow-x: auto;
    overflow-y: hidden;
}

.serendipity_backups_wrap th,
.serendipity_backups_wrap td {
    white-space: nowrap;
}

.serendipity_backups {
    border-top: 1px solid #aaa;
    width: 100%;
}

.serendipity_backups tr {
    border-bottom: 1px solid #aaa;
}

.serendipity_backups thead tr,
.serendipity_backups tr:nth-child(even) {
    background: #eee;
}

.serendipity_backups th,
.serendipity_backups td {
    padding: .25em .25em .25em 0;
}

@media screen and (min-width: 768px) {
    .serendipity_backups_wrap {
        overflow-y: auto;
    }

    .serendipity_backups_wrap th,
    .serendipity_backups_wrap td {
        white-space: normal;
    }

    .serendipity_backup_form fieldset {
        float: left;
        width: 48.5%;
        margin: 0 1.5% 1em 0;
    }

    .serendipity_backup_form fieldset:nth-of-type(even) {
        margin: 0 0 1em 1.5%;
    }

    .serendipity_backup_form .form_buttons {
        clear: left;
    }
}