html,
body {
  height: 100%;
}

body {
  background: linear-gradient(to bottom, #0148BA, #C3E2F7);
  display: -ms-flexbox;
  display: flex;
  -ms-flex-align: center;
  align-items: center;
  padding-bottom: 40px;
}

.brand{width: 250px;}
.btn-success {background-color: #9c778b; border-color: #9c778b;}
.btn-success:hover {background-color: #8a6e7d; border-color: #8a6e7d;}

.form-signin {
  width: 100%;
  max-width: 330px;
  padding: 15px;
  margin: auto;
}
.form-signin .form-control {
  position: relative;
  box-sizing: border-box;
  height: auto;
  padding: 10px;
  font-size: 16px;
  margin-bottom: 10px;
}
.form-signin .form-control:focus {
  z-index: 2;
}