
I was wondering if there's a way to make these two criss cross lines on the edges. The black box will be filled with texts. Is there anyway to do this in CSS? Thank you!

I was wondering if there's a way to make these two criss cross lines on the edges. The black box will be filled with texts. Is there anyway to do this in CSS? Thank you!
You could use a gradient background on pseudo elements to make the cross lines.
.border {
width:80%;
margin:2em auto;
padding:2em;
position:relative;
}
.border::before {
content:'';
position:absolute;
left: -10px;
top:-10px;
width: 100px;
height: 100px;
background: linear-gradient(to bottom, transparent 24px, #ddd 24px, #ddd 26px, transparent 26px), linear-gradient(to right, transparent 24px, #ddd 24px, #ddd 26px, transparent 26px);
}
.border::after {
content:'';
position:absolute;
width: 100px;
height: 100px;
right:-10px;
bottom:-10px;
background: linear-gradient(to bottom, transparent 74px, #ddd 74px, #ddd 76px, transparent 76px), linear-gradient(to right, transparent 74px, #ddd 74px, #ddd 76px, transparent 76px);
}