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

body, html {
    height: 100%;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #000000;
}

button {
    cursor: pointer;
    background: transparent;
    border: none;
    padding: 0;
}

button:focus {
    outline: none;
}