element.style {
}
:root {
    --padding: 12px;
    --font-size: 16px;
    --padding: 12px;
    --less-padding: 9px;
    --round: 16px;
    --less-round: 9px;
}
* {
    margin: 0;
    border: 0;
    box-sizing: border-box;
}

user agent stylesheet
:root {
    view-transition-name: root;
}
user agent stylesheet
html {
    display: block;
}
::-webkit-scrollbar {
    width: 9px;
}
::-webkit-scrollbar-thumb {
    background: #95a5a6;
    background-color: rgba(128,128,128,.4);
    border-radius: 4px;
}
::-webkit-scrollbar-track {
    background-color: #7f8c8d;
    background-color: rgba(128,128,128,.3);
    border-radius: 4px;
}