*{
    box-sizing: border-box;
}

.main{
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    background-color: white;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    padding: 50px;
    border-radius: 30px;
}


.calculator{
    width: 400px;
    height: 300px;
    display: grid;
    grid-template-columns: repeat(3,1fr);
    grid-template-rows: repeat(4,auto);
    gap: 10px;
    margin-top: 30px;
}

.calculator button{
    font-size: 20px;
    border-style: none;
    border-radius: 10px;
    background-color: #90cdf4;
    color: #ffffff;
}


.screen{
    display: flex;
    padding: 20px;
    justify-content: start;
    align-items: center;
    font-size: 25px;
    font-weight: bold;
    font-style: italic;
    width: 400px;
    height: 70px;
    background-color: #e3e6ec; 
    color: #000000; 
    border-radius: 50px;
}