.loading-opacity {
    opacity: 0.5;
}
#app-spinner {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: 5px solid rgba(0,0,0,0.1);
    border-left-color: maroon;
    animation: spin 1s linear infinite;
}
@keyframes spin {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}
#letter-buttons {
    display: flex;
    flex-wrap: wrap;
}
#letter-buttons .btn {
    border-color:maroon;
    border-radius: 0px;
    margin: 4px;
    border-style: solid;
    border-width: 1px;
    cursor:pointer;
    width: 2em;
    height: 2em;
    text-align: center;
}
#letter-buttons .btn:hover {
    background-color: #f2dede;
}
#letter-buttons .btn-success {
    background-color: maroon;
    color: white;
}