.loader {
    border: 16px solid #f3f3f3;
    /* Light grey */
    border-top: 16px solid #3498db;
    /* Blue */
    border-radius: 50%;
    width: 15vw;
    height: 15vw;
    animation: spin 2s linear infinite;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

.centered-loader {
    position: absolute;
    width: 100%;
    height: 100%;
    z-index: 1000;
}

.grey-background {
    background-color: rgba(70, 70, 70, 0.75);
}