* {
  box-sizing: border-box;
}

body {
  font-family: Arial, Helvetica, sans-serif;
  margin: 0px 20px 0px 20px;
  background-color: #f1f1f1;
}

/* Style the header */
.header {
  background-color: #f1f1f1;
  padding: 30px;
  text-align: center;
  font-size: 35px;
}

/* Create three unequal columns that floats next to each other */
.column {
  float: left;
  padding: 10px;
  min-height: 440px;
}

/* Left and right column */
.column.side {
  width: 25%;
}

/* Middle column */
.column.middle {
  width: 50%;
}

.column.side.left {
  border-radius: 10px 0px 0px 0px;
}

.column.side.right {
  border-radius: 0px 0px 10px 0px;
}

.column.side.left li {
  margin-bottom: 2px;
}

/* Clear floats after the columns */
.row:after {
  content: "";
  display: table;
  clear: both;
}

/* Style the footer */
.footer {
  background-color: #f1f1f1;
  padding: 10px;
  text-align: center;
}

/* Responsive layout - makes the three columns stack on top of each other instead of next to each other */
@media (max-width: 600px) {
  .column.side, .column.middle {
    width: 100%;
  }
}

.source {
  font-size: 8px;
  color: #666;
  margin-top: 10px;
}