body {
    display: flex;
    justify-content: center;
    align-items : center;
    min-height: 100vh;
    
    background-image: url("irritatingpic.png");
    background-size: repeat;

}
.calculator{
    width : 300px;
    padding: 20px;
    border : 2px solid white;
    animation: rainbow-border 2s infinite;
   

}
.calculator:hover{
    animation: rainbow-border 3s linear infinite;
}
@keyframes rainbow-border{
    0% { border-color: #ff4d6d; }
    25% { border-color: #ffd166; }
    50% { border-color: #06d6a0; }
    75% { border-color: #4dabf7; }
    100% { border-color: #ff4d6d; }
}
.display{
    width:100%;
    height : 50px;
    margin-bottom: 15px;
    font-size : 35px;

}
.button{
    display:grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}
button{
    height: 50px;
    font-size:30px;
}
.button button {
    transition: transform 0.2s ease;
}