vaadin-framework/themes/src/main/resources/VAADIN/themes/base/button/button.scss

@mixin base-button($primaryStyleName : v-button) {

/*
 * Default button (more customizable)
 * -------------------------------------- */
.#{$primaryStyleName} {
	display: inline-block;
	zoom: 1;
	text-align: center !important;
	text-decoration: none;
	border: 2px outset #ddd;
	background: #eee;
	cursor: pointer;
	white-space: nowrap;
	margin: 0;
	padding: .2em 1em;
	color: inherit;
	font: inherit;
	font-size: $font-size;
	line-height: normal;
	-webkit-touch-callout: none;
	-webkit-user-select: none;
	-khtml-user-select: none;
	-moz-user-select: none;
	-ms-user-select: none;
	user-select: none;
	-webkit-box-sizing: border-box;
	-moz-box-sizing: border-box;
	box-sizing: border-box;
}

.#{$primaryStyleName}.v-disabled {
	cursor: default;
}

.#{$primaryStyleName}-wrap,
.#{$primaryStyleName}-caption {
	vertical-align: baseline;
	white-space: nowrap;
	font: inherit;
	color: inherit;
	line-height: normal;
	}

.#{$primaryStyleName} .v-icon {
	vertical-align: middle;
	margin-right: 3px;
	border: none;
	}

.#{$primaryStyleName} .v-errorindicator {
	display: inline-block;
	zoom: 1;
	vertical-align: middle;
	float: none;
}

/* Link style (we really should deprecate this) */
.#{$primaryStyleName}-link {
	border: none;
	text-align: left !important;
	background: transparent;
	padding: 0;
	color: inherit;
	-khtml-user-select: text;
	-moz-user-select: text;
	-ie-user-select: text;
	user-select: text;
}

/* Inset Safari focus outline a bit */
.v-sa & .#{$primaryStyleName}-link:focus{
	outline-offset: -3px;
	}

.#{$primaryStyleName}-link .#{$primaryStyleName}-caption {
	text-decoration: underline;
	color: inherit;
	text-align: left;
	}

}