Bootstrap is not working on mobile

Question

i tried to run my design to the developer tools on chrome as a mobile but the bootstrap is not working. Can someone give me ideas why the bootstrap is not working on mobile?

here is the picture when i tried to run on mobile.

and this when i run on desktop it worked i don't know why not on mobile.

here is my media queries.

 @media (max-width: 768px) {
.img-responsive{
 width: 300px;
height:50px;
padding-left:50px;
}
}
@media (max-width: 376px) {
.img-responsive{
 width: 220px;
 height:50px;
 padding-left: 20px;
}
}
@media (max-width: 286px) {
.img-responsive{
 width: 180px;
 height:50px;
 padding-left: 5px;
 }
.footer{
 height: auto;
 }
 h4{
 padding-top: 50px;
 padding-left: 20px;
 }
 }

Solution

You are probably missing the viewport meta tag in the html head:

Viewport is the user's visible area of a web page. Using width=device-width you need to set the width to device width you are viewing in like mobile or tablet or desktop.

<meta name="viewport" content="width=device-width, initial-scale=1">

Refer this link : Viewport meta tag

What is Viewport?.

Comments

[nethken]

Hello sir! It works! :) Can you explain me what is viewport?

[nethken]

What is the use of css in viewport?

[Pbk1303]

nethken: you mean @viewport in css?.

[Pbk1303]

@nethken: viewport is user's visible area of the page/ area of the window in which a web content can be seen

[Jonathan Southern]

This might work better as a comment on the accepted answer or editing the existing answer to include this note

[99tharun]

This does not provide an answer to the question. Once you have sufficient reputation you will be able to comment on any post; instead, provide answers that don't require clarification from the asker. - From Review

[Oro]

Please, leave your note as comment of original answer

[code]

While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes. - From Review