style.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    background-color: #d3f1f8;
  }
  
  .vat-calc {
    background: #0ad3ff;
    padding: 3rem 1rem;
    border-radius: 10px;
    box-shadow: 0 1px 5px 0 rgba(28, 184, 227, 1);
    margin: 0 auto;
  }
  
  h2 {
    text-align: center;
    font-size: 2rem;
    text-transform: uppercase;
    padding: 1.2rem 0;
    color: #fff;
  }
  
  .main-wrapper {
    padding: 1rem;
    height: 160px;
    border-radius: 5px;
  }
  
  .button_group {
    display: flex;
  }
  
  .main-btn {
    padding: 0.6rem 0;
    font-size: 1rem;
    border-radius: 25px;
    border: none;
    outline: none;
    width: 120px;
    color: #212121;
    background: #fff;
    margin: auto;
    margin-top: 36px;
    transition: all 0.5s ease;
    cursor: pointer;
  }
  
  .main-btn:hover {
    background: #252525;
    color: #fff;
  }
  
  form {
    line-height: 1.8;
  }
  
  form label {
    font-weight: bold;
    padding-right: 0.5rem;
    color: #fff;
  }
  
  form input {
    font-size: 1rem;
    padding: 0.3rem;
    outline: none;
    border: none;
    text-align: right;
    border-radius: 5px;
  }
  
  form input[disabled] {
    border: 1ps solid #fff;
  }
  
  form div {
    display: flex;
    justify-content: space-between;
    padding: 0.3rem 0;
  }