server/apps/files/css/mobile.scss

/* 938 = table min-width(688) + app-navigation width: 250
   $breakpoint-mobile +1 = size where app-navigation is hidden +1
   688 = table min-width */
$min-table-width: 688px;
@media only screen and (max-width: $min-table-width + $navigation-width) and (min-width: $breakpoint-mobile + 1), only screen and (max-width: $min-table-width) {

.app-files #app-content.dir-drop{
	background-color: rgba(255, 255, 255, 1)!important;
}

#body-user #filestable {
	min-width: 250px;
}

table th#headerSize,
table td.filesize,
table th#headerDate,
table td.date {
	display: none;
}

/* remove padding to let border bottom fill the whole width*/
table td {
	padding: 0;
}

/* remove shift for multiselect bar to account for missing navigation */
table.multiselect thead {
	padding-left: 0;
}

#fileList a.action.action-menu img {
	padding-left: 0;
}

#fileList .fileActionsMenu {
	margin-right: 6px;
}
/* hide text of the share action on mobile */
/* .hidden-visually for accessbility */
#fileList a.action-share span:not(.icon):not(.avatar) {
	position: absolute;
	left:-10000px;
	top: auto;
	width: 1px;
	height: 1px;
	overflow: hidden;
}


/* proper notification area for multi line messages */
#notification-container {
	display: flex;
}

/* shorten elements for mobile */
#uploadprogressbar, #uploadprogressbar .label.inner {
	width: 50px;
}
/* hide desktop-only parts */
#uploadprogressbar .desktop {
	display: none !important;
}
#uploadprogressbar .mobile {
	display: block !important;
}

/* ensure that it is visible over #app-content */
table.dragshadow {
	z-index: 1000;
}

}
@media only screen and (max-width: 480px)  {
	/* Only show icons */
	table th .selectedActions {
		float: right;
	}
	table th .selectedActions > a span:not(.icon) {
		display: none;
	}

	/* Increase touch area for the icons */
	table th .selectedActions a {
		padding: 17px 14px;
	}

	/* Remove the margin to reduce the overlap between the name and the icons */
	table.multiselect th .columntitle.name {
		margin-left: 0;
	}
}