* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    background-color: rgb(70, 192, 135);
}

.container {
    background-color: rgb(27, 24, 24);
    color: white;
    width: 400px;
    margin: auto;
    padding: 10px;
    margin-top: 50px;
    font-size: 35px;
    border-radius: 10px;
    padding: 20px;
}
.calc-display {
    width: 100%;
    padding: 20px;
    height: 75px;
    margin-bottom: 10px;
    border-radius: 3px;
    border: none;
    background-color: rgb(60, 190, 66);
    font-size: 35px;
}

input[type=button] {
    width: 83px;
    height: 83px;
    margin: 2px;
    font-size: 35px;
    font-weight: bold;
    background-color: grey;
    color: white;
    border: none;
    border-radius: 8px;
}
input[type=button]:hover {
    background-color: orange;
}