.big-image {
    /* The image used */
    background-image: url('/static/images/brique_login.jpg');
    
    /* Control the height of the image */
    min-height: 570px;
  
    /* Center and scale the image nicely */
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    position: relative;
}

body {
    display: -ms-flexbox;
    display: flex;
    -ms-flex-align: center;
    align-items: center;
    padding-top: 40px;
    padding-bottom: 40px;
    background-color: #f5f5f5;
  }
  
  .form-signin {
    width: 100%;
    max-width: 330px;
    padding: 30px;
    margin: auto;
    text-align: center;
  }
  .form-signin .checkbox {
    font-weight: 400;
  }
  .form-signin .form-control {
    position: relative;
    box-sizing: border-box;
    height: auto;
    padding: 10px;
    font-size: 16px;
  }
  .form-signin .form-control:focus {
    z-index: 2;
  }
  .form-signin input[type="text"] {
    margin-bottom: -1px;
    border-bottom-right-radius: 0;
    border-bottom-left-radius: 0;
  }
  .form-signin input[type="password"] {
    margin-bottom: 10px;
    border-top-left-radius: 0;
    border-top-right-radius: 0;
  }