.greet{
    font-family: 'Nanum Gothic', serif;
    font-size:15px;
    color:#555;
    margin:10px;
    overflow:hidden;
    text-align:justify;
    line-height:1.6em;
}
.greet h3{margin-bottom:20px; font-size:19px; } 
.greet p b{color:#0072bc;}
.greet img{width:35%; float:left; }
.greet .g_txt{ width:63%; float:right;}
/* tablet */
@media screen and (min-width:769px) and (max-width:991px){
}

/* mobile */
@media screen and (max-width:768px){
    img{width:100%; height:100%; max-width:790px;}
    .greet img{display:none; }
    .greet .g_txt{ width:100%; float:none;}
}