.login-form {
  width: 340px;
  margin: 50px auto;
}

.login-form form {
  margin-bottom: 15px;
  background: white;
  box-shadow: 0px 2px 2px rgba(0, 0, 0, 0.3);
  padding: 30px;
  border-radius: 10px;
  opacity: 0.75;
}

.login-form h2 {
  margin: 0 0 15px;
}

.form-control,
.btn {
  min-height: 38px;
  border-radius: 5px;
}

.btn {
  font-size: 15px;
  font-weight: bold;
}

body {
  background: url("img/smining.jpg") no-repeat center center fixed;
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
}