body
{
  background: #f8f8f8;
}

.mainbody
{
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

 
div.header
{
    margin-top: 1em;
    margin-bottom: 1em;
}

div.header img
{
  width: 500px; max-width:100%
}


div.topic
{
  font-size: 1.4em;
  font-weight: 600;
  margin-top: 1em;
}

div.footer
{
  margin-top: 2em;
  border-top: 2px solid #ccc;
  max-width: 400px;
  color: #888;
}

.tag
{
    border: 1px solid #ccc;
    border-radius: 8px;
    padding: 3px;
    margin: 2px;
    display: inline-block;
    cursor: pointer;
    background-color: #eee;
    color: #000;
}

.tag:hover
{
    background: #888;
    color: #fff; 
    text-decoration: none;
}