* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    background: linear-gradient(to right, #2193b0, #6dd5ed);
    height: 100vh;
}
.calculator {
    max-width: 400px;
    margin: 10vh auto 0 auto;
    box-shadow: 7px 7px 7px rgba(0, 0, 0, 0.5);
    border-radius: 10px;
}

#display {
    text-align: right;
    height: 120px;
    line-height: 50px;
    padding: 16px 8px;
    font-size: 25px;
    background: black;
    color: white;
}

.input {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr;
    background-color: white;
}

.button {
    line-height: 80px;
    text-align: center;
    font-size: 25px;
    cursor: pointer;
}

.button:hover {
    background-color: black;
    color: beige;
    transition: 0.3s ease-in-out;
    font-weight: bold;
}

#equal {
    background-color: blue;
    color: beige;
}

@keyframes big {
    0%{
        font-size: 25px;
    }
    100% {
        font-size: 35px;
    }
}

@keyframes small {
    0%{
        font-size: 32px;
    }
    100% {
        font-size: 25px;
    }
}