.view-popular-tags ul.views-summary li {
    display: inline-block;
    margin: 5px;
    border-radius: 5px;
    background: #788baf;
    color: #fff;
    padding: 5px 10px;
}

.view-popular-tags ul.views-summary li:hover {
    color: #788baf;
    background: #fff;
}

.view-popular-tags ul.views-summary li a{
    color: #fff;
}

.view-popular-tags ul.views-summary li:hover a,
.view-popular-tags ul.views-summary li a:hover{
    color: #788baf;
}