For CSS

<style>

body{

}

.pg-header{

}

#elem{

background-color: blue;

}

</style>

<link rel="stylesheet" href="yourCss.css">

For js

<script type="text/javascript" src="{% static 'js/jsdemo.js'%}"></script>

<script type="text/javascript" src="yourjs.js">

function func(){

alert("msg");

};

</script>