What could be causing mobile phones to overlook my CSS media query?

My CSS includes 3 media queries that function properly when I resize the browser, but fail to work when using the responsive design tool in the inspector ("toggle device mode") and on mobile devices.

Snippet of my CSS code :

@media screen and (max-width: 1500px) {


  body {
    width: 100%;
  }
}

@media screen and (max-width: 1200px) {


  body {
    width: 100%;
  }

  #slider_container {
    float: none;
    padding-top: 2em;
    width: 75%;
    display: block;
    overflow: hidden;
    padding-left: 0px;
    margin-left: auto;
    margin-right: auto;
  }

  #slide_desc {
    //

    width: 30%;
    display: block;
    float: none;
    margin-top: 0;
    margin-left: auto !important;
    margin-right: auto;
    overflow: hidden;
    font-size: 1.3em;
    color: #353535;
/* line-height: 2em; */
    text-align: justify;
    font-family: georgia;
    width: 80%;
  }
}

@media screen and (max-width: 768px) {

  #slider_container {
    width: 100%;
    margin: 0px;
    padding: 0px;
    padding-top: 1em;
  }

  #menu_button {
    display: block;
    width: 2em;
    float: right;
    margin-top: 0.5em;
    margin-right: 2em;
    cursor: pointer;
  }

  #top_menu {
    overflow: hidden !important;
    height: 3em;
    /* background-color: gray; */
  }

  #top_menu>ul {
    margin-top: 3em;
    width: 100%;
    height: 0;
    position: absolute;
    z-index: 100;
    overflow: hidden;
  }

  #top_menu>ul>li {
    margin: 0;
    /* background-color:red !important; */
    width: 100% !important;
    display: block !important;
  }

  #top_menu>ul>li>a {
    text-align: left;
    width: 100%;
    margin-left: 0;
    padding-left: 1em;
    height: auto;
  }

  #slides_container {
    display: none;
  }
}

The first two media queries consistently work as expected, however, the third one is not being applied. It seems to only take effect when the browser itself is manually resized to below 768px.

I have checked other related questions about the issue with the usage of !important or incorrect placement of the queries. My media queries are positioned correctly at the end of the file, and it's puzzling why they behave differently based on resizing vs. using the responsive design tools.

If you have any insights into why this discrepancy might be occurring, I would greatly appreciate your input.

Answer №1

To ensure optimal display on various devices, it is important to set the viewport meta tag with

content="width=device-width, initial-scale=1"
. This specifies to the browser that the page should be rendered at the width of the device's screen, preventing any unwanted zooming out and displaying the content in a way that matches the screen size.

HTML

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

The width property defines the size of the viewport, which can be specified in pixels (e.g., width=600) or using the special value device-width to match the screen size in CSS pixels at a scale of 100%. The height and device-height values are also available for adjusting elements based on viewport height.

The initial-scale property determines the zoom level upon page load, while maximum-scale, minimum-scale, and user-scalable properties manage user control over zoom levels.

For further information on the viewport meta tag and its functionality, you can refer to this resource.

Answer №2

Due to a syntax error present in your code:

  #slide_desc {
    //

The use of double-slashes is considered invalid in CSS.

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