popup.css

.btn {
    background: #08b2f0;
    background-image: -webkit-linear-gradient(top, #08b2f0, #14a2e3);
    background-image: -moz-linear-gradient(top, #08b2f0, #14a2e3);
    background-image: -ms-linear-gradient(top, #08b2f0, #14a2e3);
    background-image: -o-linear-gradient(top, #08b2f0, #14a2e3);
    background-image: linear-gradient(to bottom, #08b2f0, #14a2e3);
    -webkit-border-radius: 13;
    -moz-border-radius: 13;
    border-radius: 13px;
    font-family: Arial;
    color: #ffffff;
    font-size: 20px;
    padding: 1px 15px 3px 14px;
    text-decoration: none;
  }
  
  .btn:hover {
    background: #291929;
    background-image: -webkit-linear-gradient(top, #291929, #570157);
    background-image: -moz-linear-gradient(top, #291929, #570157);
    background-image: -ms-linear-gradient(top, #291929, #570157);
    background-image: -o-linear-gradient(top, #291929, #570157);
    background-image: linear-gradient(to bottom, #291929, #570157);
    text-decoration: none;
  }

  h3{text-align: center;}

  h3 a{
      text-align: center;
      font-weight: 800;
      color: red;
      text-decoration: none;
      background: yellow;
  }
  input:hover{
      background-color: aqua;
  }