/* :root{--bg:#2b1d0e}*{box-sizing:border-box}body{margin:0;font-family:Arial}
.feature-section{height:400vh;background:#111} */
.sticky{position:sticky;top:0;height:100vh;background:var(--bg);overflow:hidden}
.panel{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;color:#fff;font-size:60px;opacity:0;transform:translateX(-120px)}
.panel.active{opacity:1;transform:translateX(0)}
.feature-section{
    position:relative;
    height:400vh;   /* ye uncomment karo - zaroori hai */
}

.sticky{
    position:sticky;
    top:0;
    width:100%;
    height:100vh;
    overflow:hidden;
    background:#2b1d0e;
}

.panel{
    position:absolute;
    inset:0;
    display:flex;
    justify-content:center;
    align-items:center;
    opacity:0;
    visibility:hidden;
    transform:translateX(-150px);
}

.panel:first-child{
    opacity:1;
    visibility:visible;
    transform:translateX(0);
}