Overleaf/services/web/public/stylesheets/app/editor/toolbar.less

.toolbar {
	height: 40px;
	border-bottom: 1px solid @toolbar-border-color;

	a {
		position: relative;
		.label {
			position: absolute;
			top: 0;
			right: 0;
			padding: .15em .6em .2em;
			font-size: 60%;
		}
	}

	a:not(.btn) {
		display: inline-block;
		color: @gray-light;
		padding: 4px 10px 5px;
		margin: 1px 2px;
		border-radius: @border-radius-small;
		&:hover {
			text-shadow: 0 1px 0 rgba(0, 0, 0, 0.25);
			color: @gray-dark;
			text-decoration: none;
		}
		&.active, &:active {
			.label {
				display: none;
			}
			color: white;
			background-color: @link-color;
			.box-shadow(inset 0 3px 5px rgba(0, 0, 0, 0.225));
			&:hover {
				color: white;
			}
		}
	}

	.btn-full-height {
		border: none;
		border-radius: 0;
		border-right: 1px solid @toolbar-border-color;
		color: @link-color;
		padding: 3px 10px 5px;
		font-size: 20px;
		&:hover {
			text-shadow: 0 1px 0 rgba(0, 0, 0, 0.15);
			background-color: darken(white, 10%);
			color: @link-hover-color;
		}
		&.active, &:active {
			color: white;
			background-color: @link-color;
			.box-shadow(inset 0 3px 5px rgba(0, 0, 0, 0.225));
		}
		.label {
			top: 4px;
			right: 4px;
		}
	}

	.toolbar-right {
		float: right;
		.btn-full-height {
			border-right: 0;
			border-left: 1px solid @toolbar-border-color;
		}
	}

	.toolbar-center {
		width: 300px;
		position: absolute;
		top: 0;
		left: 50%;
		margin-left: -150px;
		text-align: center;
		text-overflow: ellipsis;
		overflow: hidden;
	}

	&.toolbar-header {
		box-shadow: 0 0 2px #ccc;
		position: absolute;
		top: 0;
		left: 0;
		right: 0;
		z-index: 1;
	}

	&.toolbar-small {
		height: 32px;
		a {
			padding: 4px 2px 2px;
			margin: 0;
			margin-left: 6px;
		}
		.toolbar-right {
			a {
				margin-left: 0;
				margin-right: 6px;
			}
		}
	}

	&.toolbar-tall {
		height: 58px;
		padding-top: 10px;
		a.btn {
			margin: 0 (@line-height-computed / 2);
		}
		a {
			padding: 4px 10px 5px;
		}
	}

	&.toolbar-alt {
		background-color: #fafafa;
	}
}

.editor-dark {
	.toolbar-alt {
		background-color: darken(@editor-dark-background-color, 0%);
	}
	.toolbar {
		border-color: @editor-dark-toolbar-border-color;
		.btn-full-height {
			border-color: @editor-dark-toolbar-border-color;
			&:hover {
				background-color: black;
				color: lighten(@link-color, 10%);
			}
		}
		&.toolbar-header {
			box-shadow: none;
		}
		a:not(.btn) {
			color: @gray;
			&:hover {
				color: @gray-light;
			}
		}
	}
}