.question
{
    text-align: center;
}

.spinner-border {

    display: inline-block;
    width: 2rem;
    height: 2rem;
    vertical-align: text-bottom;
    border: .25em solid currentColor;
    border-right-color: transparent;

    border-radius: 50%;
    -webkit-animation: spinner-border .75s linear infinite;
    animation: spinner-border .75s linear infinite;
}

.sr-only {

    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    white-space: nowrap;
    border: 0;
}

/* Safari 4.0 - 8.0 */
@-webkit-keyframes spinner-border {
    to { transform: rotate(360deg); }
}

/* Standard syntax */
@keyframes spinner-border {
    to { transform: rotate(360deg); }
}

.quiz .jumbotron {
    padding: 1.5rem 0.75rem;
}

.quiz .jumbotron .btn {
    font-size: 16px;
    padding: 5px 10px;
    margin-bottom: 5px;
}

.quiz, .quiz-results {
    width: 95%;
    margin: auto;
    background-color: rgba(255, 255, 255, 0.7);
}

.quiz-results {
    padding: 20px;
}
@media (max-width: 1300px) {
    .quiz h1 {
        font-size: 1.5rem;
    }
    .quiz p.lead {
        font-size: 1rem;
    }
    .quiz .answers .btn {
        padding: 8px 16px;
    }
}

.quiz h2, .quiz-results h2 {
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.quiz h4, .quiz-results h4 {
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.question .img-wrapper {
    margin: auto;
}

.quiz .answer {
    display: inline;
}

.quiz .answers {
    margin-top: 1rem;
}

.quiz .img-credits {
    position: absolute;
    color: white;
    background: rgba(0,0,0,0.2);
    font-size: 10px;
}

.quiz-results .coffees .retry {
    margin-top: 1.5rem;
}

.quiz-results .buy-buttons {
    margin-top: 5px;
}