style.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    width: 100%;
    height: 100vh;
    background-color: #000;
    overflow: hidden;
    font-family: sans-serif;
}

#vis-container {
    width: calc(100% - 32px);
    height: calc(100% - 90px);
    margin: 16px;
    background-color: #08090a;
    overflow: auto;
}

#input-container {
    height: 50px;
    margin-top: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
}

#shape {
    width: 120px;
    padding: 2px 5px;
    margin: 0 5px;
}

#draw-btn,
#download-btn {
    height: 24px;
    padding: 2px 5px;
    border-radius: 3px;
    font-size: 13px;
    display: inline-flex;
    align-items: center;
    cursor: pointer;
}

#draw-btn {
    border-style: solid;
    border-color: #63c8e4;
    background-color: #63c8e4;
}

#download-btn {
    margin-left: 5px;
    background-color: #63e463;
    text-decoration: none;
    color: #000;
}

footer {
    width: 100%;
    color: #fff;
    position: fixed;
    text-align: center;
    bottom: 16px;
}

footer a {
    color: #5050ff;
}