#slider-left-but { 
	display: block; 
	width: 30px; 
	height: 30px; 
	border: none; 
	background: url(left.png); 
	margin-right: 10px; 
}

#slider-right-but { 
	display: block; 
	width: 30px; 
	height: 30px; 
	border: none; 
	background: url(right.png); }

	  
	*, *:before, *:after {
		box-sizing: inherit;
	  }
	  
	  .column {
		float: left;
		width: 33.3%;
		margin-bottom: 16px;
		padding: 0 8px;
	  }
	  
	  .card {
		box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2);
		margin: 8px;
	  }
	  
	  .about-section {
		padding: 50px;
		text-align: center;
		background-color: #474e5d;
		color: white;
	  }
	  
	  .container {
		padding: 0 16px;
	  }
	  
	  .container::after, .row::after {
		content: "";
		clear: both;
		display: table;
	  }
	  
	  .title {
		color: grey;
	  }
	  
	  .button {
		border: none;
		outline: 0;
		display: inline-block;
		padding: 8px;
		color: white;
		background-color: #000;
		text-align: center;
		cursor: pointer;
		width: 100%;
	  }
	  
	  .button:hover {
		background-color: #555;
	  }
	  
	  @media screen and (max-width: 650px) {
		.column {
		  width: 100%;
		  display: block;
		}
	  }