silverstripe-cms/scss/_AssetAdmin.scss

.cms .AssetAdmin {
	.cms-content-toolbar {
		.cms-page-add-button {
			@include background-image (linear-gradient(lighten(#e6e6e6, 5%), darken(#e6e6e6, 5%)));
			border-color:#c0c0c2;
			span.btn-icon-add {
				height:17px;
			}
			span.ui-button-text {
				color:#393939;
				text-shadow: white 0 1px 1px;
			}
		}
	}	
	#Form_EditForm_File {
		td {
			// Taken care of by minimum image sizes
			padding-top: 0;
			padding-bottom: 0;
			&.bottom-all {
				padding:0.7em;
			}
		}
		td.col-StripThumbnail {
			padding: 0;
			width: 32px;
			height: 32px;
			display: block;

			img {
				width: 32px;
				height: 32px;
			}
		}
		// TODO Figure out how to share sprites and SCSS rules between sapphire/admin/scss and cms/scss
		tr[data-class=Folder] {
			td.col-StripThumbnail {
				background: transparent url(../../sapphire/admin/images/sprites-32x32/blue-folder-horizontal.png) no-repeat top left;
			}
		}
		tr[data-class=File] {
			td.col-StripThumbnail {
				background: transparent url(../../sapphire/admin/images/sprites-32x32/blue-document.png) no-repeat top left;
			}
		}
	}
}