#emotion {
    width: 600px;
    margin-bottom: 10px;
    text-align: center;
} 

#emotion ul li {
    width: 25px;
    display: block;
    float: left;
    padding: 4px;
} 

#emotion ul li img {
    cursor: pointer;
} 

#emotion ul {
    list-style-type: none;
    display: inline;
}