style.css

body {
    background-color: #121212 !important;
}

.container {
    padding: 2% !important;
    background-color: whitesmoke !important;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    margin: 2%;
}

.navbar {
    padding-left: 5% !important;
    padding-right: 5% !important;
}

.main {
    padding: 2% !important;
}

/* damn scrollbar */
body::-webkit-scrollbar {
    background-color: #fff;
    width: 16px;
}

/* background of the scrollbar except button or resizer */
body::-webkit-scrollbar-track {
    background-color: #fff;
}

/* scrollbar itself */
body::-webkit-scrollbar-thumb {
    background-color: #babac0;
    border-radius: 16px;
    border: 4px solid #fff;
}

/* set button(top and bottom of the scrollbar) */
body::-webkit-scrollbar-button {
    display:none;
}