.main-img{
  height: 450px; width: 450px;
}

@media only screen and (max-width: 900px){
    .welcome-area{
        padding-top: 50px;
        height: 1000px;
    }
    .welcome-thumbnail img{
        margin-top: 100px;
        width: 400px;
        height: 400px;
    }
    .map{
        width: 700px;
    }

.upr-img{
    height: 200px;
    line-height: 300px;
    padding: 0 40px;
}
.cards{
    flex-wrap: wrap;
    justify-content: center;
}
}
@media only screen and (max-width: 700px){
    .map{
        width: 400px;
    }
}