*
{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Times New Roman', Times, serif;
    font-size: x-large;
}
body
{
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    display: flex;
    background: linear-gradient(to right, #000000, #434343);
}

.Calculator
{
    position: relative;
    width: 300px;
}

.Calculator .button
{
    position: relative;
    display: grid;
}

.Calculator .button #value
{
    position: relative;
    grid-column: span 4;
    line-height: 100px;
    height: 100px;
    padding: 0 20px;
    border-radius: 10px;
    background-color: #434343;
    text-align: right;
    font-size: 1.5rem;
    overflow: hidden;
    box-shadow: inset 0 6px 1px 0 rgba(0, 0, 0, 0.35),
    0 5px 5px rgba(0, 0, 0, 0.5),
    0 15px 5px rgba(0, 0, 0, 0.35);
    user-select: none;
}

.Calculator .button span
{
    position: relative;
    padding: 10px;
    margin: 6px;
    min-width: 40px;
    color: aliceblue;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 6px;
    border: 2px solid #222;
    background: linear-gradient(#000000, #373737);
    box-shadow: inset 0 6px 1px 0 rgba(0, 0, 0, 0.35),
    0 5px 5px rgba(0, 0, 0, 0.5),
    0 15px 5px rgba(0, 0, 0, 0.35);
}

.Calculator .button span#Clear
{
    grid-column: span 2;
    background: red;
    color: #fff;
}

.Calculator .button span#equal
{
    grid-column: span 2;
    background: rgb(0, 2, 97);
    color: #fff;
}
.Calculator .button span#plus
{
    background: rgb(0, 117, 21);
    color: #fff;
}