* {
    box-sizing: border-box;
  }
  
  body {
    margin: 0;
    min-width: 992px;
    font-family: "Helvetica";
  }
  
  /* navigation bar */
  
  .navbar {
    height: 66px;
    background-color: white;
    text-align: center;
    line-height: 66px;
  }
  
  #logo {
    vertical-align: middle;
  }
  
  /* main */
  
  .main {
    background-image: linear-gradient(135deg, #B0A8FF 0%, #786FFF 100%);
    padding: 80px 0;
    min-height: calc(100vh - 66px);
  }
  
  .container {
    background: #FFFFFF;
    box-shadow: 2px 2px 4px 2px rgba(0,0,0,0.10);
    border-radius: 10px;
    width: 600px;
    margin: 0 auto;
    text-align: center;
    padding: 32px 66px;
  }
  
  .container h2 {
    font-size: 24px;
    color: #4A4A4A;
    margin: 0;
    margin-bottom: 28px;
  }
  
  .container h2 span {
    font-weight: 700;
    color: #786FFF;
  }
  
  .container .img-row {
    margin-bottom: 40px;
  }
  
  .container .img-row img {
    vertical-align: middle;
    margin: 0 6px;
  }
  
  .date-row {
    margin-bottom: 40px;
  }
  
  label[for=start] {
    font-size: 16px;
    color: #4A4A4A;
    line-height: 34.5px;
    vertical-align: middle;
    margin-right: 13px;
  }
  
  input[type=date] {
    border: 1px solid #786FFF;
    border-radius: 5px;
    padding: 8px 14px;
    vertical-align: middle;
    font-size: 16px;
  }
  
  #calculate {
    width: 100%;
    background: #786FFF;
    box-shadow: 0 2px 4px 0 rgba(0,0,0,0.50);
    border-radius: 5px;
    color: white;
    font-size: 18px;
    padding: 14px 0;
    border: none;
    cursor: pointer;
  }