.input-group-addon {
     color: #797979;
     border-bottom: 1px solid #bbb;
     border-top: 1px solid #bbb;
     border-left: 1px solid #bbb;
}

.input-group-btn {
     color: #797979;
     border-bottom: 1px solid #bbb;
     border-top: 1px solid #bbb;
     border-right: 1px solid #bbb;
}