CSS position

by Wentz Wu

HTML

<div class="wrapper">
  <div class="container">
    <div id="box1" class="box"></div>
    <div id="box2" class="box"></div>
    <div id="box3" class="box"></div>
  </div>
</div>

CSS

.wrapper {
  border: 1px dashed black;
  padding: 5px;
}

div {
  border: 1px solid red;
  margin: 1px;
}

.box {
  width: 50px;
  height: 50px;
}

.container {
  width: 90%;
  height: 90vh;
}