html {
    background: url(../writingboard.jpg) no-repeat center center fixed;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
}


body {
    border-radius: 5px;
    background: none;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
}

#overlay-div {
    background: whitesmoke;
    width: 110px;
    height: 110px;
    position: fixed;
    top: calc(50% - 55px);
    left: calc(50% - 55px);
    z-index: 100;
}

#overlay-div>p {
    text-align: center;
    background-color: whitesmoke;
    color: black;
}

#overlay {
    width: 100px;
    height: 100px;
    margin: 5px;
    text-align: center;
    border-radius: 50%;
    border: #becbd2 4px solid;
    border-top: 4px solid #3498db;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg)
    }
}

.loading-spinner {
    animation: spin 2s linear infinite;
}