add .card layout defition
@ -362,6 +362,10 @@ select {
@keyframes spin {
0% { transform: rotate(0deg); }
100% { transform: rotate(360deg); }
}
.card {
width: 500px;
background: grey #424949;
box-sizing: border-box;
})=====";
size_t style_css_len = sizeof(style_css)-1;