align div close to posts

align div close to posts

i own a blog url http://www.rayaaskart.com/ . I placed a code for social
sharing button . you can see it is aligned to left side of the window on
my site. i want to align near to blog posts . how i can do it by modifying
the css . i included the style code along with this message.
<style>
.float_sharer
{
text-align:center;
width:70px;
border-radius: 10px;
background-color:white;
padding : 10px;
position: fixed;
box-shadow:0 0 10px #999 inset;
top: 200px;
left: 0px;
z-index: 10;
}
</style>