devices.css
/*
    Big screens
*/

@media screen and (min-width: 701px) {
  html, body {
    min-height: 700px;
  }

  header {
    margin-top: 20px;
    line-height: 100px;
    & h1 {
      font-size: 36px;
      font-weight: 100;
    }
    & .buttons {
      top: calc(~"25% - 100px");
    }
  }

  footer {
    bottom: 20px;
    font-size: 12px;
    padding: 0 200px;

    & img {
      margin-bottom: 20px;
      width: 40px;
    }
  }

  section {
    width: 370px;
    height: 370px;
    margin-left: -185px;
    margin-top: -185px;

    & .header {
      padding: 60px 80px 0 80px;
    }
  }


  & textarea {
    width: 300px;
    height: 60px;
    margin-top: 30px;
    padding: 10px;
    font-size: 12px;

    &.empty {
      border: 1px dashed #707070;
    }
  }

  & .back textarea {
    font-size: 18px;
    padding-top: 33px;
  }

  & button {
    width: 190px;
    height: 50px;
    border-radius: 25px;
    font-size: 24px;
    margin-top: 35px;
  }

  & .clear {
      margin: 20px auto 0 auto;
  }
}

/*
    Small screens
*/

@media screen and (max-width: 700px) {
  html, body {
    min-height: 450px;
  }

  header {
    margin-top: 10px;
    padding: 0 5px;
    & h1 {
      font-size: 18px;
      font-weight: 300;
      line-height: auto;
    }
    & .buttons{
      top: calc(~"25% - 70px");
    }
  }

  footer {
    width: 100%;
    bottom: 10px;
    font-size: 10px;


    & img {
      margin-bottom: 10px;
      width: 20px;
    }
  }

  section {
    width: 300px;
    height: 300px;
    margin-left: -150px;
    margin-top: -150px;

    & .header {
      padding: 40px 30px 10px 30px;
      font-size: 16px;
    }
  }

  .content {
    width: 300px;
    text-align: center;

    & section {
      width: 300px;
      height: 300px;
      position: absolute;
      top: 50%;
      left: 50%;
      margin-left: -150px;
      margin-top: -150px;
      -webkit-transition: all .5s;

    }
  }

  & textarea {
    width: 220px;
    height: 60px;
    margin-top: 15px;
    font-size: 11px;
    padding: 10px;
  }

  & .back textarea {
    font-size: 16px;
    padding-top: 27px;
    opacity: 1;
  }

  & button {
    width: 140px;
    height: 40px;
    border-radius: 25px;
    font-size: 20px;
    margin-top: 25px;
  }

  & .clear {
      margin: 10px auto 0 auto;
  }

  & .arrow {
    margin-top: -12px;
  }
}
