demo.css

/* Some basic page styles */
body {
	background-color: #fff;
	font-family: sans-serif;
	margin: 4% 10%;
}

/* Label styles: style as needed */
label {
	display:block;
	margin-top:2em;
	font-size: 0.9em;
	color:#777;
}

.dark-wrapper {
	margin-top: 2em;
	padding: 1em 1em 1em;
	background: #444;
}

.dark-wrapper label {
	margin-top: 0;
	color: #ccc;
}


/* These are the "theme" styles for our button applied via separate button class, style as you like */
/* Set the background fallback to solid #fff so Firefox renders the <option> list readably. */
.button {
	border: 1px solid #bbb;
	border-radius: .3em;
	box-shadow: 0 1px 0 1px rgba(0,0,0,.04);
	background: #f3f3f3; /* Old browsers */
	background: #fff -moz-linear-gradient(top, #ffffff 0%, #e5e5e5 100%); /* FF3.6+ */
	background: #fff -webkit-gradient(linear, left top, left bottom, color-stop(0%,#ffffff), color-stop(100%,#e5e5e5)); /* Chrome,Safari4+ */
	background: #fff -webkit-linear-gradient(top, #ffffff 0%,#e5e5e5 100%); /* Chrome10+,Safari5.1+ */
	background: #fff -o-linear-gradient(top, #ffffff 0%,#e5e5e5 100%); /* Opera 11.10+ */
	background: #fff -ms-linear-gradient(top, #ffffff 0%,#e5e5e5 100%); /* IE10+ */
	background: #fff linear-gradient(to bottom, #ffffff 0%,#e5e5e5 100%); /* W3C */
}
.custom-select {
	margin-top: 0.5em;
}
.custom-select select {
	/* General select styles: change as needed */
	font-family: sans-serif;
	font-weight: 700;
	color: #444;
	line-height:1.3;
	border-radius: .2em;
}
.custom-select::after {
	width: 0;
	height: 0;
	border-left: 4px solid transparent;
	border-right: 4px solid transparent;
	border-top: 7px solid #666;
	margin-top: -3px;
}
.custom-select {
	border: 1px solid #bbb;
}
/* Hover style */
.custom-select:hover {
	border-color: #888;
}
/* Focus style */
.custom-select select:focus {
	/* It'd be nice to use -webkit-focus-ring-color here but it doesn't work on box-shadow */
	box-shadow: 0 0 1px 3px rgba(59, 153, 252, .7);
	box-shadow: 0 0 0 3px -moz-mac-focusring;
	color: #222; /* Match-02 */
}
@supports ( box-shadow: none ) {
	.custom-select select:focus {
		outline: none;
	}
}

/* Set options to normal weight */
.custom-select option {
	font-weight:normal;
}