#emotion {
    width: 400px;
    margin-bottom: 5px;
    text-align: center;
} 

#emotion ul li {
    width: 15px;
    display: block;
    float: left;
    padding: 2px;
} 

#emotion ul li img {
    cursor: pointer;
} 

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