.audio-player {
    width: 90%;
    margin: auto;
    margin-top: 20px;
}

.control-group {
    margin-top: 20px;
}

#preloader {
    display: none;
    margin: auto;
}

.btn-custom {
    margin-top: 20px;
}

.audio-container {
    width: 50%;
    margin: auto;
}

@media (max-width: 880px) {
    .audio-container {
        width: 90%;
    }
}

@media (max-width: 600px) {
    .audio-container {
        width: 98%;
    }
}

.form-control:focus {
    box-shadow: none;
}

.btn {
    display: inline-block;
    font-weight: 400;
    line-height: 1.5;
    color: #212529;
    text-align: center;
    text-decoration: none;
    vertical-align: middle;
    cursor: pointer;
    -webkit-user-select: none;
    -moz-user-select: none;
    user-select: none;
    border: 1px solid transparent;
    padding: 0.375rem 0.75rem;
    font-size: 1rem;
    border-radius: 0.25rem;
    transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out, border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}
.btn-primary {
    color: #fff;
    background-color: #0d6efd;
    border-color: #0d6efd;
}
.btn-success {
    color: #fff;
    background-color: #198754;
    border-color: #198754;
}