.logo{
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgb(2,0,36);
    /* https://cssgradient.io/ */
    background: linear-gradient(135deg, rgba(156,39,176,1) 0%, rgba(255,152,0,1) 100%);
    display: flex;
    justify-content: center;
    align-items: center;
}