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chromium/third_party/blink/web_tests/scrollbars/custom-scrollbar-for-iframe-changing-dynamically-expected.html 

<!DOCTYPE HTML>
<style>
/* Let's get this party started */
::-webkit-scrollbar {
    width: 20px;
	height: 25px;
}
 
/* Track */
::-webkit-scrollbar-track {
    -webkit-box-shadow: inset 0 0 6px rgba(0,0,0,0.3); 
    -webkit-border-radius: 10px;
    border-radius: 10px;
}
 
/* Handle */
::-webkit-scrollbar-thumb {
    -webkit-border-radius: 10px;
    border-radius: 10px;
    background: rgba(255,0,0,0.8); 
    -webkit-box-shadow: inset 0 0 6px rgba(0,0,0,0.5); 
}

</style>
<iframe src="resources/scrollable-iframe.html"></iframe>
<iframe src="resources/scrollable-iframe.html"></iframe>