.infoBox { 
    background-color: #FFF; 
    width: 210px; 
    font-family: Arial, Helvetica, sans-serif; 
    font-size: 14px; 
    margin-top: 10px;
    padding:15px;
    border-radius:5px;
}

.infoBox:before { 
    border-left: 10px solid transparent; 
    border-right: 10px solid transparent; 
    border-bottom: 10px solid #fff; 
    top: -10px; 
    content: ""; 
    height: 0; 
    position: absolute; 
    width: 0; 
    left: 93px;
}