.container {
    width: 1em;
    height: 1em;

    display: flex;
    flex-direction: column;
    justify-content: stretch;

    > img {
        flex-grow: 1;
    }
}

.iconLoading {
    border: .2em solid #f3f3f3; /* Light grey */
    border-top: .2em solid #3498db; /* Blue */
    border-radius: 50%;
    animation: loading_spin 2s linear infinite;

    width: 1em;
    height: 1em;
}

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