body, html{
    height: 100%;
}

body{
    display: flex;
    justify-content: space-around;
    align-items: center;
    background-color: #121212;
    --s: 20px; /* size  */
    --m: 1px; /* margin */
    --f: calc(1.732 * var(--s) + 4 * var(--m) - 1px);
    flex-direction: column;
}

h1{
    color: white;
    font-family: Arial, Helvetica, sans-serif;
}

.back-button {
    position: absolute;
    top: 20px;
    left: 20px;
    color: white;
    text-decoration: none;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 16px;
    padding: 10px 20px;
    background-color: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 8px;
    transition: all 0.3s ease;
}

.back-button:hover {
    background-color: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateX(-3px);
}

#sizeConstraint{
    width: 390px;
}

#drawingWrapper {
    display: flex;
    
}

#drawingArea {
    font-size: 0; /*disable white space between inline block element */
}

.hex {
    width: var(--s);
    margin: var(--m);
    height: calc(var(--s) * 1.1547);
    display: inline-block;
    font-size: initial;
    clip-path: polygon(0% 25%, 0% 75%, 50% 100%, 100% 75%, 100% 25%, 50% 0%);
    margin-bottom: calc(var(--m) - var(--s) * 0.2885);
    transition: 0.1s;
}

#drawingArea::before {
    content: "";
    width: calc(var(--s) / 2 + var(--m));
    float: left;
    height: 120%;
    shape-outside: repeating-linear-gradient(
        #0000 0 calc(var(--f) - 3px),
        #000 0 var(--f)
    );
}

.controls{
    display: flex;
    justify-content: space-between;
    align-items: center;
    justify-self: end;
}

button{
    margin-top: calc(var(--s) / 2);
    padding: 20px;
    background-color: darkgray;
    border: gray 2px solid;
    font-weight: bold;
    font-family: Arial, Helvetica, sans-serif;
    text-transform:uppercase;
}

button:hover{
    background-color: gray;
}

.leftSet{
    display: flex;
    align-items: center;
}

input, output{
    color: white;
    margin-top: calc(var(--s)/2);
}

output{
    padding: 20px;
    font-size: 24px;
    font-family: Arial, Helvetica, sans-serif;
}