body {
    font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
    background-color: #888;
    margin: 0;
    padding: 0;
    height: auto;
}

#content {
    position: relative;
    min-height: 100vh;
    padding-bottom: 200px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.section{
    margin-bottom: 48%;
}

footer {
    position: absolute;
    margin-top: auto;
    bottom: 0;
    width: 100%;
    font-family: inherit;
    font-size: small;
    display: flex;
    justify-content: center;
    align-self: center;
}

*,
*:before,
*:after {
    box-sizing: border-box;
}

h1, h3 {
    text-align: center;
    text-justify: auto;
    font-weight: bolder;
    text-transform: uppercase;
}

table {
    margin: auto;
    background-color: chocolate;
    width: 295px;
    height: 325px;
    text-align: center;
    border-radius: 25px;
    padding-right: 10px;
    padding-left: 10px;
    padding-top: 30px;

    padding-bottom: 10px;
}

input {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    position: relative;
    color: #495069;
    border: solid 0;
    width: 60px;
    height: 60px;
    border-radius: 200px;
    margin: 5px;
    font-size: 42px;
    padding: 2px 2px;
    text-align: center;
}

#clear {
    text-transform: uppercase;
}

#opposite {
    font-size: xx-large;
}

input.button:active {
    left: 2px;
    border: 0;
    background-color: #fff;
    border-radius: 200px;
    width: 57px;
    height: 57px;
    float: left;
    margin: 5px;
    font-size: 40px;
}

#display {
    width: 280px;
    max-width: 285px;
    font-size: 56px;
    text-align: right;
    background-color: transparent;
    position: relative;
    border: hidden;
}

#zero {
    width: 140px;
    border-end-end-radius: 50%;
}