Add to CSS

.widgettitle {
text-align:center;
font-size:18px;
padding-bottom: 20px;
}

.et_pb_widget ul li {
background-color: #333333;
padding: 10px 10px;
color: #fff;
font-size: 14px;
font-weight: 600;
line-height: 1;
letter-spacing: 1.2px;
text-transform: uppercase;
margin-bottom:10px;
border: solid 1px #000;
}