* {
    padding: 0;
    margin: 0;
  }
  
  body {
    width: 100vw;
    height: auto;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    background-image: linear-gradient(to right, rgb(0, 26, 255) , yellow);
    font-family: sans-serif;
  }

  h1 {
    width: 100%;
    text-align: center;
    height: 50px;
    color: #fff;
      
  }

  .calculator {
    width: 300px;
    padding-bottom: 15px;
    border-radius: 7px;
    background-color: rgb(245, 245, 245);
    box-shadow: 5px 8px 8px -2px rgba(0, 0, 0, 0.61);
  }

  .display {
    width: 100%;
    height: 80px;
    border: none;
    box-sizing: border-box;
    padding: 10px;
    font-size: 2rem;
    background-color: #ec991dbe;
    color: #fff;
    text-align: right;
    border-top-left-radius: 7px;
    border-top-right-radius: 7px;
  }

  .row {
    display: flex;
    justify-content: space-between;
  }

  button {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: none;
    outline: none;
    font-size: 1.5rem;
    background-color: rgb(12, 174, 202);
    color: #fff;
    margin: 10px;
  }
  
  button:hover {
    cursor: pointer;
    opacity: 0.6;
  }

  .operator {
    background-color: #ec991dbe;
    color: #fff;
  }