buble.less

.buble {
    border: 1px solid #ccc;
    padding: 5px 10px;
    margin: 5px; 
    display: table-cell; /* required for vertical align to work */
    vertical-align: middle;   
    text-align: center;

    &.1x {
        border-radius: 20px;
    }

    .content {
        display: inline-block; /* required for vertical align to work */
    }
}