I can't use the scroll bar style

[Kukaina]

My system is Windows 11，I wrote this code in index.scss, but it does not take effect. Other codes written in index.scss can take effect.
`html {
scrollbar-width: thin; /* Firefox /
scrollbar-color: blue orange; / Firefox */
}

body::-webkit-scrollbar {
width: 12px;
}

body::-webkit-scrollbar-track {
background: orange;
}

body::-webkit-scrollbar-thumb {
background-color: blue;
border-radius: 20px;
border: 3px solid orange;
}`
My scrollbar still looks like this

[Skaidon]

Same issue here.