style.css

body {
    width: 100%;
    height: 100%;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #171816;
}

div {
    width: 100%;
    height: 100%;
    margin: 0 auto;
    background-color: #171816;
    display: flex;
    flex-flow: column;
    align-items: center;
    justify-content: center;
}

h1 {
    color: #a1f10b;
    font-size: 30px;
    font-weight: 600;
    font-family: sans-serif;
}

p {
    color: #0bf17e;
    font-size: 18px;
    font-weight: 400;
    font-family: sans-serif;
}

button {
    border: none;
    color: rgb(41, 6, 236);
    background-color:#171816;
    padding: 15px 32px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    margin: 4px 2px;
    cursor: pointer;
}

button:hover {
    background-color:#202020;
    color: #0bbbf1;
}