index_css.html

<style>
* {
  font-family: 'Baloo Da 2', cursive;
  color: #302b63;
}
    
body {
  height: 100vh; 
  background: linear-gradient(125deg, #24243e, #302b63, #0f0c29);
  background-size: cover;
  background-repeat: no-repeat;
}
    
h1 {
  margin-top: 5px;
}
    
#container {
position: absolute;
  top: 35%;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: white;
  padding: 25px;
  border: 1px solid #302b63;
  box-shadow: 0px 4px 10px #ddd5,
              0px 6px 15px #ddd5,
              0px 8px 20px #ddd5,
              0px 10px 25px #ddd5;
  border-radius: 10px;
}
    
input[type='submit'] {
  background-color: white;
  border-radius: 3px;
  color: #302b63;
  font-size: 16px;
  border: 1px solid #302b63;
  transition: all 0.2s ease-in-out;
}
    
input[type='submit']:hover {
  cursor: pointer;
  background-color: #302b63;
  color: white;
}
</style>