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

.container {
  position: relative;
  height: 400px;
  border: 2px solid #006100;
  padding: 10px;
}

.center {
  max-width: fit-content;
  margin-left: auto;
  margin-right: auto;
}