.modal-ads {
    display: none;
    width: 400px;
    position: fixed;
    bottom: 10px;
    right: 10px;
    z-index: 5;
    border: 2px solid #ffffff;
    transition: 0.6s;
}
.modal-ads img {
    float: left;
    width: 100%;
}
.modal-ads .close {
    position: absolute;
    right: 10px;
    top: 10px;
    width: 25px;
    height: 25px;
    font-size: 18px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #ffffff;
    cursor: pointer;
}
@media only screen and (max-width: 990px) {
    .modal-ads {
        display: block;
    }
}
@media only screen and (max-width: 500px) {
    .modal-ads {
        width: calc(100% - 20px);
    }
}