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

.box {
    width: 100px;
    height: 100px;
    background-color: aquamarine;
    margin: 30px;
    color: #ff0000;
    padding: 20px;
    border: 5px solid rgb(192, 0, 0);
    font-size: 20px;
}