Product landing page, need help to make it responsive

Code Feedback
1

Hey guys i have a made a product landing but i cant make it responsive, i need help.

2

@TechBrains Hey brother, I think it will be easier to start building your page at the mobile size. Then slowly expand outwards and add media queries.

@media only screen and (min-width: 400px) {
    /* Add your code here. */
}

@media only screen and (min-width: 600px) {
    /* Add your code here. */
}

@media only screen and (min-width: 1000px) {
    /* Add your code here. */
}