body {
    background-image: url("img/sicite2017.jpg");
    background-repeat: no-repeat;
    background-size: 100%;

}
.btn {
    background: #e05312;
    background-image: -webkit-linear-gradient(top, #e05312, #ed321d);
    background-image: -moz-linear-gradient(top, #e05312, #ed321d);
    background-image: -ms-linear-gradient(top, #e05312, #ed321d);
    background-image: -o-linear-gradient(top, #e05312, #ed321d);
    background-image: linear-gradient(to bottom, #e05312, #ed321d);
    -webkit-border-radius: 28;
    -moz-border-radius: 28;
    border-radius: 28px;
    font-family: Arial;
    color: #ffffff;
    font-size: 20px;
    padding: 10px 20px 10px 20px;
    text-decoration: none;

  }

      .btn:hover {
    background: #f00909;
    background-image: -webkit-linear-gradient(top, #f00909, #f01111);
    background-image: -moz-linear-gradient(top, #f00909, #f01111);
    background-image: -ms-linear-gradient(top, #f00909, #f01111);
    background-image: -o-linear-gradient(top, #f00909, #f01111);
    background-image: linear-gradient(to bottom, #f00909, #f01111);
    text-decoration: none;
}
center {
    margin-top: 55%;
}