style.css

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

html, body {
    width: 100%;
    height: 100%;
    background-color: #121216;
    color: #fff;
    user-select: none;
    font-family: system-ui;
    position: relative;
    /*scroll-behavior: smooth;*/
}

.title {
    text-align: center;
    line-height: 2;
}

.desc {
    text-align: center;
    line-height: 2;
}

.start {
    outline: none;
    border: 1px solid #0ff;
    background-color: transparent;
    color: #0ff;
    font-weight: 600;
    padding: 10px;
    border-radius: 10px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    left: 50%;
    transform: translateX(-50%);
}

#pi {
    user-select: all;
    margin: 5px;
    padding: 10px;
    color: #0ff;
    border: 1px solid #0ff;
    border-radius: 10px;
    word-wrap: break-word;
    margin-bottom: 10px;
    transition: all 0.25s ease-in-out;
}

footer {
    text-align: center;
    color: #0ff;
    line-height: 3;
}