It looks like I can set style.
Try delete space in bracket and save

< style>
p{font-family:meiryo;
}
</ style>

CSS Post it efect

CSSで付箋紙エフェクト

Gingkoでポストイットを挿入

#CSSだけで実装可能！

<style>
.todo{
font-family:meiryo;
text-decoration:none;
font-size:3em;
line-height:1.15em;
color:#000;
background:#ffc;
display:block;
height:80%;
width:80%;
padding:1em;
margin:auto;
/*Firefox*/
-moz-box-shadow:5px5px7pxrgba(33,33,33,1);
/*Safari+Chrome*/
-webkit-box-shadow:5px 5px 5px rgba(33,33,33,.7);
/*Opera*/
box-shadow:5px5px7pxrgba(33,33,33,.7);
-webkit-transform:rotate(-6deg);
-o-transform:rotate(-6deg);
-moz-transform:rotate(-6deg);
}
</style>

背景を変える

Change background

<style>
body { 

    background-image: url("http://basicbackground.com/wp-content/uploads/2014/09/background-pictures-1024x640.jpg");
    background-repeat:no-repeat;
-webkit-background-size:cover;
-moz-background-size:cover;
-o-background-size:cover;
background-size:cover;
background-position:center;
}
</style>