That is just how Chrome/Safari (Webkit) works. Try adding this css to keep it visible;
.hero-content-split .inner-page-wrap::-webkit-scrollbar {
-webkit-appearance: none;
}
.hero-content-split .inner-page-wrap::-webkit-scrollbar:vertical {
width: 11px;
}
.hero-content-split .inner-page-wrap::-webkit-scrollbar:horizontal {
height: 11px;
}
.hero-content-split .inner-page-wrap::-webkit-scrollbar-thumb {
border-radius: 8px;
border: 2px solid white; /* should match background, can't be transparent */
background-color: rgba(0, 0, 0, .5);
}
.hero-content-split .inner-page-wrap::-webkit-scrollbar-track {
background-color: #fff;
border-radius: 8px;
}
– Ed