CSS gap issue in div element

The problem sounds to be related to CSS, try using the following solution:

.tg-topcity, .tg-popularcities {
    width: 100%;
    display :inline-block;
    float: left;
}

or you may also try this instead:

.tg-topcity, .tg-popularcities{
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
}