body{
  font-family: Helvetica, Verdana, Georgia, sans-serif;
  margin: 20px;
}
h4{
  font-size: 80%;
  font-style: italic;
  font-weight: normal;
  margin-bottom: 40px;
}
a:link { /* unvisited link */
  color: #5877c4;
}
a:visited { /* visited link */
  color: #9d58c4;
}
button{
  color: #fff;
  background-color: #5877c4;
  border-style: none;
  padding: 5px 20px;
  margin: 5px;
  cursor: pointer;
}
.header{
  display: flex;
  justify-content: center
}

.code{
  font-family: "Courier New", Courier, monospace;
  word-break: break-all;
}