style.css

body {
    padding: 2rem 1rem;
    overflow-x: hidden;
    background: center/cover url(../img/bg.png);
    font: 700 1.2rem "Jura", sans-serif;
    background: linear-gradient(63deg, #999 23%, transparent 23%) 0.44rem 0,
      linear-gradient(63deg, transparent 74%, #999 78%),
      linear-gradient(63deg, transparent 34%, #999 38%, #999 58%, transparent 62%),
      #444;
    background-size: 1rem 3rem;
  }
  
  .converter {
    background-color: #999999de;
    margin-bottom: 2rem;
    padding: 1.3rem 2rem 2rem;
    border: 0.1rem solid #808080;
  }
  
  input {
    padding: 0.2rem;
    font-size: 1.1rem;
    outline: none;
    border-radius: 0.1rem;
    width: 20rem;
    text-indent: 0.2rem;
    background-color: #fdfdfd;
  }
  
  input:focus {
    background-color: #f1f1f1;
  }
  
  footer {
    background-color: #999999de;
    border: 0.1rem solid #808080;
  }
  
  .footer-link:hover {
    transition: 0.3s ease;
    color: #cdd4df;
  }
  
  #loadingDiv {
    top: 0;
    left: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    width: 100vw;
    height: 100vh;
    position: absolute;
    background-color: #535353;
  }
  
  .loader {
    width: 3.6rem;
    height: 3.6rem;
    background: center / contain no-repeat url(../img/loader.gif);
  }
  
  ::selection {
    color: #fdfdfd;
    background-color: #444;
  }
  button {
    padding: 10px;
    font-size: 1.2em;
    color: #180101;
    width: 100px;
    height: 50px;
    border-radius: 2px;
    outline: none;
    margin-top: 3px;
    margin-left: 590px;
  }
  
  @media screen and (max-width: 450px) {
    html {
      font-size: 13px;
    }
  }
  
  @media screen and (max-width: 350px) {
    html {
      font-size: 11px;
    }
  }