.hdr{
    padding: 5rem;
    text-align: center;
    background-color: ghostwhite;
    margin: 4rem;
}
.form{
    margin-top: 5rem;
    padding: 2rem;
    border: 2px solid black;
}
.contacts{
   margin-top: 6rem;  
}
.size-img{
    width: 40%;
}
iframe{
    width: 100%;
    margin-left: 1rem;
}

@media screen and (max-width: 980px) {

    .hdr{
        margin: 1rem 0 0 0;
    }

    iframe{
        width: 70%;
       
    }

.col-8{
    width: 100%;
}
.col-4{
    width: 100%;
}
.btn{
    width: 100%;
}
}