.login-page{
  background:#7b3fe4;
  display:flex;
  justify-content:center;
  align-items:center;
  height:100vh
}
.login-box{
  background:white;
  padding:30px;
  width:340px;
  border-radius:10px;
  text-align:center
}
.login-box input,.login-box button{
  width:100%;
  padding:10px;
  margin-top:10px;
}
button{
  background:#7b3fe4;
  border:0;
  color:white;
}
.err{color:red}