.ballon {
padding: 0.6em 1em;
position: relative;
border-radius: 6px;
}

.ballon.gray {
background: #eee;
}

.ballon.gray.bottom:after {
content: '';
position: absolute;
border-top: 10px solid #eee;
border-right: 5px solid transparent;
border-left: 5px solid transparent;
bottom: -9px;
left: 5px;
}