/*.center {
  position: absolute;
  left: 0;
  top: 5%;
  width: 100%;
  text-align: center;
  font-size: 18px;
}
*/

ul {
  font-size: 1em; /* 14px/16=0.875em */
}

.center {
  border: 1px solid black;
  margin-top: 100px;
  margin-bottom: 100px;
  margin-right: 100px;
  margin-left: 100px;
  padding-top: 50px;
  padding-right: 30px;
  padding-bottom: 50px;
  padding-left: 80px;
  background-color: lightblue;
}