1、为什么使用em em也是css中的一种单位,和px类似。很多人会疑惑为什么有了px之后还要使用em,而且em使用起来相对于px来讲比较麻烦。 em主要是应用于弹性布局,下面给出一个小栗子说明em的强大之处 DOCTYPE html> ...
... body { margin: 0; height: 100vh; display: flex; align-items: center; justify-content: center; background: linear-gradient(lightpink, white); } 画出一个红色圆点: .heart { font-s...
... body { margin: 0; height: 100vh; display: flex; align-items: center; justify-content: center; background: linear-gradient(lightpink, white); } 画出一个红色圆点: .heart { font-s...
... body { margin: 0; height: 100vh; display: flex; align-items: center; justify-content: center; background-color: skyblue; } 设置伪元素的共有属性,后面有多处用到伪元素: .pig::before, .pig::after,...
... body { margin: 0; height: 100vh; display: flex; align-items: center; justify-content: center; background-color: skyblue; } 设置伪元素的共有属性,后面有多处用到伪元素: .pig::before, .pig::after,...
... body { margin: 0; height: 100vh; display: flex; align-items: center; justify-content: center; } 定义容器尺寸: .desk { width: 70em; height: 70em; font-size: 5px; posit...
... body { margin: 0; height: 100vh; display: flex; align-items: center; justify-content: center; } 定义容器尺寸: .desk { width: 70em; height: 70em; font-size: 5px; posit...
... body { margin: 0; height: 100vh; display: flex; align-items: center; justify-content: center; background: linear-gradient(to left bottom, linen, tan); } 画出相机的轮廓: .camera { ...
... body { margin: 0; height: 100vh; display: flex; align-items: center; justify-content: center; background: linear-gradient(to left bottom, linen, tan); } 画出相机的轮廓: .camera { ...
...的那个角的值与对角相等(如2、3、4) 1、border-radius: 2em;( border-radius: 2em 2em 2em 2em;) 等价于: border-top-left-radius: 2em; border-top-right-radius: 2em; border-bottom-right-radius: 2em; border-bottom-left-radi...
... body { margin: 0; height: 100vh; display: flex; align-items: center; justify-content: center; background-color: mediumturquoise; } 定义容器尺寸: .panda { width: 21em; hei...
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