* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

.box {
  width: 100px;
  height: 100px;
  background-color: #3498db;
  margin: 30px;
  color: #fff;
  padding: 20px;
  border: 5px solid red;
  font-size: 20px;
}