JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://jquery-ui.googlecode.com/svn/trunk/ui/jquery.ui.core.js"></script>
<script src="http://jquery-ui.googlecode.com/svn/trunk/ui/jquery.ui.position.js"></script>
<div class="main">
    <div class="one"></div>
</div>

CSS

.main {
    width: 90%;
    height:200px;
    background:#000;
}


.one {
    width: 20px;
    height:20px;
    background:#f00;
}

JavaScript

function moveit() {
    $(".one").position({
        "my": "right top",
        "at": "right top",
        "of": $(".main"),
        "collision": "fit fit"
    });
}

$(window).resize(function(){
   moveit(); 
});

moveit();