How to center CSS style an empty box for the QR camera?

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I'm currently designing QR code scanner with a box but it's not getting center

What I have tried:

.element{
                                  align-self: center;
                                  display: block;
                                  position:justify;
                                  
                                  margin-left: 100px;
                                  margin-right: auto;
                                
                            
                                 
                                  top:0px;
                                  width:500px;
                                  height:310px;
                                  background:rgba(0,0,0,0.5) ;
                                  -webkit-clip-path: polygon(0% 0%, 0% 100%, 25% 100%, 25% 25%, 75% 25%, 75% 75%, 25% 75%, 25% 100%, 100% 100%, 100% 0%);
                                  clip-path: polygon(0% 0%, 0% 100%, 25% 100%, 25% 25%, 75% 25%, 75% 75%, 25% 75%, 25% 100%, 100% 100%, 100% 0%);
                                  
                                }

Posted 24-Feb-22 19:20pm

Master Sanity

Updated 25-Feb-22 1:09am

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Graeme_Grant · Answer 1 · 2022-02-25T01:09:00

There are many different ways to do what you want. align-self requires the element to be inside of a grid or flexbox element parent - ref: align-self - CSS: Cascading Style Sheets | MDN[^]

Here is a video that will show you one what how to: The fastest way to center vertically & horizontally with CSS - YouTube[^]

The reason why I posted the video is that Kevin is an Expert with many videos that will answer other questions for you beyond the one above.