.calculator {
    width: 350px;
    margin: 0 auto;
    border: 1px solid black;
    padding: 10px;
    border-radius: 5px;
    background-color: rgb(220, 215, 215);
    font-family: 'Times New Roman', Times, serif;
    
}
p{
    text-align: center;
    font-size: 40px;
    font-style: italic;
    font-weight: bold;
    border: black;
}
  
.display {
    background-color: #eee;
    padding: 10px;
    font-size: 20px;
    text-align: right;
    margin-bottom: 10px;
    width:auto;
    height:30px;
    border:1px solid black;
}
  
.buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-gap: 5px;
}

button {
    padding: 10px;
    font-size: 16px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}
  
.operator {
    background-color: #ff9800;
    color: white;
}