.btn {
    border-radius: 99px;
}

.btn:focus,
.btn:active,
.btn:active:focus,
.btn:hover {
    outline: 0;
}

.game .btn {
    border-radius: 4px;
}

.game .score-button {
    border-radius: 0;
}

.score-button.multiplier-toggled {
    transition:all 0.5s ease-in-out;
    animation:multiplier-toggled-keyframes normal 1.1s infinite ease-in-out;
}

@keyframes multiplier-toggled-keyframes {
    0% {
        background-color: #5cb85c
    }
    50% {
        background-color: #7bf17b
    }
    100% {
        background-color: #5cb85c
    }
}