body {
  background-image: linear-gradient(to top, #91a1ff, #4759ec);
  color: #fff;
  width: 100%;
  height: 100%;
}

.simple-login-container {
  position: relative;
  width: 300px; 
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
}

.simple-login-container > img {
  position: relative;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
}

.simple-login-container h2{
  font-family: Roboto;
  font-size: 30px;
  font-weight: 500;
  line-height: 1.51;
  letter-spacing: 1.5px;
  text-align: center;
  margin-bottom: 20px;
}

.simple-login-container .btn-login{
  background-color: #4759ec;
  color: #fff;
}