body {
  color: #1a191c;
}

.contentbox {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

.left {
  width: 350px;
}

.middle {
  width: 650px;
}

.right {
  width: 350px;
}

.footer {
  width: 1350px;
}

.section {
  border-width: 5px;
  border-style: hidden;
  margin: 5px;
  padding: 15px;
  background-clip: padding-box;
}