body {
    line-height: 34px;
    color: #777777;
    width: 100%;
  }

  * {
    box-sizing: border-box;
  }

  /* general */

 .container{
    font-family: "Source Sans Pro", "Arial", sans-serif;
    font-size: 18px;
    background-color: #fef392;
    text-align: center;
    width: 100%;
    height: 100%;
    min-height: 500px;
    margin: 0 auto;
  }

  header{
    color: #6363d5;
    height: 100px;
    font-size: 30px;
    font-family: monospace;
    margin-bottom: 20px;
    margin-top: 20px;
    padding-top: 20px;
  }

  .clearfix {
    content: "";
    clear: both;
    display: table;
  }

  button {
    width: 20px;
    height: 20px;
    padding: 0;
    cursor: pointer;
    clear: both;
    margin: 0 auto;
  }

  .nextBtn, .doneBtn, .startBtn {
    width: 100px;
    height: 30px;
    padding: 10px;
    margin-right: 10px;
    cursor: pointer;
  }