.modal_window {
    background: url("../images/popup-img.jpg") center top no-repeat;
    background-size: cover;
    position: relative;
    width: calc(100% - 30px);
    max-width: 600px;
    height: 300px;
    box-sizing: border-box;
    font-family: "Lato", sans-serif;
    -webkit-background-size: 100% auto;
    background-size: 100% auto;
}
.modal_window .close_modal_btn {
    display: flex;
    position: absolute;
    right: 20px;
    top: 15px;
    width: 30px;
    height: 30px;
    border-radius: 100%;
    justify-content: center;
    align-items: center;
    background: rgba(255, 255, 255, 0.6);
    -webkit-transition-property: all;
    -moz-transition-property: all;
    -ms-transition-property: all;
    -o-transition-property: all;
    transition-property: all;
    -webkit-transition-duration: 0.5s;
    -moz-transition-duration: 0.5s;
    -ms-transition-duration: 0.5s;
    -o-transition-duration: 0.5s;
    transition-duration: 0.5s;
    -webkit-transition-timing-function: ease;
    -moz-transition-timing-function: ease;
    -ms-transition-timing-function: ease;
    -o-transition-timing-function: ease;
    transition-timing-function: ease;
}
.modal_window .close_modal_btn:hover {
    background: white;
    box-shadow: 1px 2px 12px rgba(0, 0, 0, 0.3);
}