*{
    font-family: sans-serif;
}

#snake-game{
    background: #ddd;
    width: 450px;
    height: 450px;
    margin: 0px auto;
}

.center{
    text-align: center;
}

.buttons{
    width: 450px;
    margin: 30px auto 10px;
    display: flex;
    justify-content: space-around;
    align-items: center;
}

#start_stop_btn{
    outline: none;
    border: none;
    border-radius: 2px;
    background: green;
    padding: 5px 10px;
}

stop{
    background: red;
}