@keyframes twinkle{

0%{

opacity:.45;

}

50%{

opacity:.9;

}

100%{

opacity:.45;

}

}
.window-frame::after{

content:"";

position:absolute;

left:-100%;

top:40px;

width:180%;

height:45px;

background:

rgba(255,255,255,.05);

filter:blur(8px);

animation:clouds 22s linear infinite;

}
@keyframes clouds{

0%{

transform:translateX(0);

}

100%{

transform:translateX(120%);

}

}