* {
box-sizing: border-box;
}

body {
margin: 0;
font-family: Arial, Helvetica, sans-serif;
}

.header {
text-align: center;
padding: 32px;
}

.paragraph {
text-align: center;
padding: 2px;
}

.row {
display: -ms-flexbox; /* IE 10 */
display: flex;
-ms-flex-wrap: wrap; /* IE 10 */
flex-wrap: wrap;
padding: 0 4px;
}

/* Create two equal columns that sits next to each other */
.column {
-ms-flex: 50%; /* IE 10 */
flex: 50%;
padding: 0 4px;
}

.column img {
margin-top: 8px;
vertical-align: middle;
}

/* Style the buttons */
.btn {
border: none;
outline: none;
padding: 10px 16px;
background-color: #f1f1f1;
cursor: pointer;
font-size: 18px;
}

.btn:hover {
background-color: #ddd;
}

.btn.active {
background-color: #666;
color: white;
}