body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #f2f2f2;
  }
  
  .calculator {
    background-color: #000000;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 14px 18px rgba(0, 0, 0, 0.85);
  }
  
  #display {
    color: #f2f2f2;
    width: 100%;
    height: 50px;
    text-align: right;
    margin-bottom: 10px;
    font-size: 1.5em;
    box-shadow: 0 4px 18px rgba(233, 229, 229, 0.85);
  }
  
  .buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    
  }
  
 button{
    padding: 20px;
    font-size: 1.2em;
    cursor: pointer;
    box-shadow: 0 4px 8px rgba(241, 241, 240, 0.85);
  }
  button:hover{
    background-color: rgb(255, 0, 0);
  }
  .btnp{
    background-color: blue;
  }
  .btns{
    background-color: rgb(255, 107, 1);
  }
  .btnm{
    background-color: darkgreen;
  }
  .btnd{
    background-color: gold;
  }
  .btnr{
    background-color: steelblue;
  }
