body{
    padding: 0;
    margin: 0;
}
@media only screen and (max-width: 767px) {
    .desktop{
        display: none;
    }
    button{
        bottom: 15px;
        left: 15%;
        height: 50px;
        width: 70%;
        background-color: #1b439b;
        border-radius: 10px;
        color: #FFF;
        box-shadow: 5px 5px 7px #646464;
    }
       
}
@media screen and (min-width: 767px) {
    .mobile {
        display: none;
    }
    button{
        bottom: 15%;
        right: 23%;
        height: 50px;
        width: 350px;
        background-color: #ffffff;
        color: #1524a3;
        box-shadow: 5px 5px 7px #000000;
        border-radius: 5px !important;
    }
}

div{
    position: relative;
}
img{
    width:100%;
}
button{   
    position: absolute;    
    font-size: 1rem;
    font-weight: bold;
    border: none;
}