问题 Simple question really, I want to know how I would make a triangles width (made in css with the below code) equal to the page width so when the browser resizes so does the triangle. My Code, So far .triangle { color: crimson; width: 0; height: 0; margin-top: 30%; border-top: 100px solid crimson; border-left: 100px solid transparent; border-right: 100px solid transparent; } 回答1: .triangle { color: crimson; width: 0; height: 0; margin-top: 30%; border-top: 100px solid crimson; border-left: 50vw