.source__qrcode {
    width: 40% !important;
    height: 40% !important;
}
.preview-slider__qr {
    max-height: 200px;
    max-width: 200px;
}
.input-group-addon:last-child {
    border-left: 0;
}
.input-group .form-control:last-child, .input-group-addon:last-child, .input-group-btn:first-child>.btn-group:not(:first-child)>.btn, .input-group-btn:first-child>.btn:not(:first-child), .input-group-btn:last-child>.btn, .input-group-btn:last-child>.btn-group>.btn, .input-group-btn:last-child>.dropdown-toggle {
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
}
.input-group-addon {
    padding: 6px 20px;
    font-size: 14px;
    font-weight: 400;
    line-height: 1;
    color: #555;
    text-align: center;
    background-color: #eee;
    border: 1px solid #ccc;
    border-radius: 4px;
}
.input-group-addon, .input-group-btn {
    width: 1%;
    white-space: nowrap;
    vertical-align: middle;
}
.input-group .form-control, .input-group-addon, .input-group-btn {
    display: table-cell;
}
.input-group {
    position: relative;
    /*display: table;*/
    border-collapse: separate;
}