Keeping parent div to width and height of wrapping children

Question

I am building a simple calendar. I am wanting the months to wrap responsively on screen, and the parent container to keep the width and height of its children. For example, if t

Answer 1

html,
body {
  box-sizing: border-box;
  font: 400 16px/1.5'Palatino Linotype';
  height: 100vh;
  width: 100vw;
  overflow-x: auto;
  overflow-y: auto;
}
*,
*:before,
*:after {
  box-sizing: inherit;
  margin: 0;
  padding: 0;
  border: 0;
}
body {
  background-color: #222;
  color: #EFE;
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
.shell {
  display: flex;
  position: relative;
  padding: 1.5em .75em;
  margin: 0 auto;
  height: 300%;
  width: 300%;
  width: -moz-max-content;
  width: -webkit-max-content;
  width: max-content;
}
.content {
  position: absolute;
  font-variant: small-caps;
  left: 0;
}
.cal {
  display: flex;
  flex-flow: row wrap;
  outline: 3px solid yellow;
  width: -moz-min-content;
  width: -webkit-min-content;
  width: min-content;
  max-width: 900px;
  flex: 3 0 90%;
}
.month {
  float: left;
  width: 250px;
  height: 170px;
  outline: 3px solid red;
  display: inline-block;
  flex: 1 1 50%;
}

  

    

      
Jan
      
Feb
      
Mar
      
Apr
      
May
      
Jun
      
Jul
      
Aug
      
Sep
      
Oct
      
Nov
      
Dec