html {
  margin: 0;
  padding: 0;
  background: rgb(248, 244, 244);
}

  .calculator {
    width: 350px; 
    height: 450px;
    margin: auto; 
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 20px;
    background: #86e7ee;
    border-radius: 10px;
    box-shadow: 2px 2px 10px rgba(0, 0, 0, 0.2);
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  
  
  .display {
    width: 90%;
    background: white;
    padding: 15px;
    font-size: 2rem;
    text-align: right;
    border-radius: 15px;
    margin-bottom: 15px;
    margin-left: 10px;
    margin-right: 10px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
  }
  
  
  .buttons {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
  }
  
  
  .button {
    padding: 15px;
    font-size: 1.5rem;
    background: #09419a;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    text-align: center;
  }
  
  .button:hover {
    background: #1d1ad1;
  }
  
  
  .button.clear {
    background: #7e0ebf;
    grid-column: span 4;
    margin-top: 10px;
  }
  
  .button.clear:hover {
    background: #7c0c60;
  }