为什么 z-index 在我的代码中不起作用？

Question

My z-index in CSS is not working. My fixed header becomes invisible as soon as I scroll over another container. Then I wanted to increase the z-index, but it doesn't work.

I want my fixed header to no longer become invisible as soon as I scroll over a container. Here is my code:

.header {
    width: 100%;
   
    height: 95px;
    background-color: rgba(0, 0, 0, 0.813);
    position: fixed;
    top: 0;
    z-index: 1;
    

Answer 1

z-index does NOT work on fixed-positioned items.

Alternatively, you can make a child inside the header, and set the z-index on that.