main {
    margin-left: 15%;
    margin-right: 15%;
}

p {
    line-height: 1.5em;
}

#description {
    margin: auto;
    width: 50%;
    text-align: center;
}

#caption {
    margin-top: -6em;
    margin-bottom: 5em;
    margin-left: auto;
    margin-right: auto;
    width: 50%;
    text-align: center;
}

.top {
    margin-top: 4em;
    margin-bottom: 4em;
    display: grid;
    grid-template-columns: repeat(2, 1fr); 
}

#square {
    padding-right: 3em;
    width: 90%;
}

em {
    font-weight: bold;
}

#demo {
    padding-top: 5em;
    padding-bottom: 5em;
    display: block;
    margin: auto;
    border: none;
    width: 84%;
    height: 35em;
    margin-bottom: 4em;
}

.code_img {
    width: 28em;
    margin: 2em;
}

#input_content {
    display: grid;
    grid-template-columns: 60% 30%;
}