.contents {
  display: flex;
}
.left {
  width: 50%;
}
.right {
  width: 50%;
}
p {
  margin-bottom: 1em;
}
.header-decoration {
  padding-left: 10px;
  border-left: 5px solid #021d5c;
}

@media screen and (max-width: 768px) {
  .contents {
    display: block;
  }
  .left,
  .right {
    width: 100%;
  }
}