html,
body {
  background-color: #FFFFFF;
  color: #000;
  text-align: center;
}

body {
  background:
    linear-gradient(
      rgba(0, 0, 0, 0.35),
      rgba(0, 0, 0, 0.35)
    ),
    url(/documenti/img/autoscuola.jpg);
  background-size: cover;
  background-position: center;
  border: none;
  padding-top: 0px !important;
  background-position: center;
  background-attachment: fixed;
  background-repeat: no-repeat;
  height: auto !important;
  min-height: 100%;
}
.well .well-warning {
  background-color: #F7CA18 !important;
}
.top-container {
  padding: 20px;
}
.top-container, .top-container * {
  color: #FFF !important;
}
.outer {
    display: table;
    position: absolute;
    left: 0px;
    right: 0px;
    height: 100%;
    width: 100%;
}
.middle {
    display: table-cell;
    vertical-align: middle;
}
.inner {
    margin-left: auto;
    margin-right: auto;
    float: none;
}