Untitled

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
  <style>
    body {
      background-color: #585858;
    }
    .outer-wrapper {
      width: 50vw;
      min-height: 50px;
      margin: 100px auto;
      background-color: #00a8e6;
      border: 1px dashed blue;
      overflow: hidden;
    }
    .inner-wrapper {
      height: 500px;
      width: 101%;
      margin-left: -1%;
      background-color: transparent;
    }

    .container {
      display: inline-block;
      float: left;
      width: 25%;
      height: 25%;
      padding-left: 1%;
      background-color: lightslategray;
      box-sizing: border-box;
    }

    .white {
      background-color: white;
      height:100%;
      width:100%;
    }

  </style>
</head>
<body>
<div class="outer-wrapper">
  <div class="inner-wrapper">
    <div class="container"><div class="white"></div></div>
    <div class="container"><div class="white"></div></div>
    <div class="container"><div class="white"></div></div>
    <div class="container"><div class="white"></div></div>
  </div>
</div>
</body>
</html>