button,
input[type=submit],
.button {
	outline: none;
	box-shadow: 0 1px 1px 1px rgba(0,0,0,0.2);
	border-radius: 4px;
	text-indent: 0;
	display: inline-block;
	//border: 1px solid rgba(0,0,0,0.2);
	border: 0;
	color: var(--color_bg_dark);
	line-height: 28px;
	text-decoration: none;
	padding: 0;
	padding-left: 4px;
	padding-right: 4px;
	margin: 2px;
	background-color: var(--color_bg_dark_10);
	cursor: pointer;
	font-weight: 500;
  	position: relative;
  	overflow: hidden;
  	vertical-align: middle;
  }
button:hover,
input[type=submit]:hover,
.button:hover {
    background-color: var(--color_bg_dark_50);
	color: white;
	transition: all 300ms;
	}
button:active,
input[type=submit]:active,
.button:active {
	position: relative;
	}
.button_open,
.button_delete,
.button_copy,
.button_switch,
.button_design,
.button_compare,
.button_calc,
.button_expand,
.button_collapse,
.button_variant {
	opacity: 0.8;
	vertical-align: middle;
	padding-top: 2px;
	height: 20px;
	width: 20px;
}
.button_lock,
.button_unlock,
.button_export {
	opacity: 0.8;
	vertical-align: middle;
	padding-top: 2px;
	height: 20px;
	width: 15px;
}
.button_sync,
.button_redraw {
	opacity: 0.8;
	vertical-align: middle;
	padding-top: 2px;
	height: 20px;
	width: 15px;
}
.button_example {
	opacity: 0.8;
	vertical-align: middle;
	padding-top: 2px;
	height: 20px;
	width: 26px;
}
.button_ok,
.button_fail {
	opacity: 0.8;
	vertical-align: middle;
	padding-top: 2px;
	height: 20px;
	width: 20px;
}

.small_button {
	font-size: 13px;
}
.big_button {
	font-size: 50px;
}
.inline_button {
	line-height: 16px;
	height: 16px;
	margin: 0;
	margin-left: 4px;
	vertical-align: middle;
}
.circle_red {
	border-radius: 50%;
	padding 2px;
	background-color: rgb(150,0,0);
	color: white;
}
.circle_yellow {
	border-radius: 50%;
	padding 2px;
	background-color: #bbbb00;;
	color: #333;
}
.ripple {
    position: relative;
    overflow: hidden;
}
.ripple:after {
    content: "";
    display: block;
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
    background-image: radial-gradient(circle, #000 10%, transparent 10.01%);
    background-repeat: no-repeat;
    background-position: 50%;
    transform: scale(10, 10);
    opacity: 0;
    transition: transform .5s, opacity 1s;
}
.ripple:active:after {
    transform: scale(0, 0);
    opacity: .2;
    transition: 0s;
}
.material-icons-inverted {
	color: white;
	opacity: 0.8;
	transition: 250ms all;
	margin-right: 10px;
}
.material-icons-inverted:hover {
	opacity: 1;
	transition: 250ms all;
}
b.date-label {
	font-weight: normal;
	background-color: var(--color_bg_dark);
	color: white;
	font-size: 0.8em;
	border-radius: 2px;
	padding: 1px;
	padding-left: 2px;
	padding-right: 2px;
}