style.css

img[alt*="Info icon"] {
    display: none;
}

#html5-qrcode-button-camera-permission {
    padding: 12px 12px;
    border: 1px solid #90A4AE;
    background-color: #E0F7FA;
}

#html5-qrcode-button-camera-start {
    padding: 12px 12px;
    border: 1px solid #90A4AE;
    background-color: #2E7D32;
    color: #fff;
}

#html5-qrcode-button-camera-stop {
    padding: 12px 12px;
    border: 1px solid #90A4AE;
    background-color: #F4511E;
    color: #fff;
}

#html5-qrcode-anchor-scan-type-change {
    color: #1976D2;
    text-decoration: none !important;
}

#html5-qrcode-anchor-scan-type-change:hover {
    text-decoration: underline !important;
}

#html5-qrcode-button-file-selection {
    padding: 12px 12px;
    border: 1px solid #90A4AE;
    background-color: #E0F7FA;
}

#qr-reader-results ul {
    padding: 0;
}

#qr-reader-results ul li {
    position: relative;
    display: block;
    padding: 10px 15px;
    margin-bottom: -1px;
    background-color: #fff;
    border: 1px solid #ddd;
}

#html5-qrcode-select-camera {
    padding: 7px 12px;
}