ocean turtle w/ boxes

for the main den css:
<link rel="stylesheet" type="text/css" href="https://codepen.io/dsmndmiles/pen/GBGXyo.css" />
for the boxes:
<link rel="stylesheet" type="text/css" href="https://codepen.io/dsmndmiles/pen/OwEooW.css" />
<div style="width:500px;background:#31AF9E;border:0px solid;color:#000000;" class="leftbox">this is for the top box!</div>
<div style="width:500px;background:#31AF9E;border:0px solid;color:#000000;" class="leftbox">this is for the bottom box!</div>