border-spacing
<https://developer.mozilla.org/zh-CN/docs/Web/CSS/border-spacing>
border-spacing 属性指定相邻单元格边框之间的距离（只适用于 边框分离模式 ）。相当于 HTML 中的 cellspacing 属性，但是第二个可选的值可以用来设置不同于水平间距的垂直间距。
border-spacing 值也适用于表格的外层边框上，即表格的边框和第一行的、第一列的、最后一行的、最后一列的单元格之间的间距是由表格相应的（水平的或垂直的）边框间距（border-spacing）和相应的（上，右，下或左）内边距之和。
语法
length 描述单元格之间的水平和垂直距离的一个
<length>值。它只在单值语法下使用。horizontal 描述相邻两列的单元格之间的水平距离的一个
<length>值。它只在双值语法下使用。vertical 描述相邻两行的单元格之间的垂直距离的一个
<length>值。它只在双值语法下使用。inherit 一个表示父元素的 border-spacing 的计算值的关键字，其父元素必须应用了 border-spacing 。
Border Spacing
用法
| Class | Properties |
|---|---|
| border-spacing-0 | border-spacing: 0px 0px; |
| border-spacing-x-0 | border-spacing: 0px var(--tw-border-spacing-y); |
| border-spacing-y-0 | border-spacing: var(--tw-border-spacing-x) 0px; |
| border-spacing-px | border-spacing: 1px 1px; |
| border-spacing-x-px | border-spacing: 1px var(--tw-border-spacing-y); |
| border-spacing-y-px | border-spacing: var(--tw-border-spacing-x) 1px; |
| border-spacing-0.5 | border-spacing: 0.125rem 0.125rem; |
| border-spacing-x-0.5 | border-spacing: 0.125rem var(--tw-border-spacing-y); |
| border-spacing-y-0.5 | border-spacing: var(--tw-border-spacing-x) 0.125rem; |
| border-spacing-1 | border-spacing: 0.25rem 0.25rem; |
| border-spacing-x-1 | border-spacing: 0.25rem var(--tw-border-spacing-y); |
| border-spacing-y-1 | border-spacing: var(--tw-border-spacing-x) 0.25rem; |
| border-spacing-1.5 | border-spacing: 0.375rem 0.375rem; |
| border-spacing-x-1.5 | border-spacing: 0.375rem var(--tw-border-spacing-y); |
| border-spacing-y-1.5 | border-spacing: var(--tw-border-spacing-x) 0.375rem; |
| border-spacing-2 | border-spacing: 0.5rem 0.5rem; |
| border-spacing-x-2 | border-spacing: 0.5rem var(--tw-border-spacing-y); |
| border-spacing-y-2 | border-spacing: var(--tw-border-spacing-x) 0.5rem; |
| border-spacing-2.5 | border-spacing: 0.625rem 0.625rem; |
| border-spacing-x-2.5 | border-spacing: 0.625rem var(--tw-border-spacing-y); |
| border-spacing-y-2.5 | border-spacing: var(--tw-border-spacing-x) 0.625rem; |
| border-spacing-3 | border-spacing: 0.75rem 0.75rem; |
| border-spacing-x-3 | border-spacing: 0.75rem var(--tw-border-spacing-y); |
| border-spacing-y-3 | border-spacing: var(--tw-border-spacing-x) 0.75rem; |
| border-spacing-3.5 | border-spacing: 0.875rem 0.875rem; |
| border-spacing-x-3.5 | border-spacing: 0.875rem var(--tw-border-spacing-y); |
| border-spacing-y-3.5 | border-spacing: var(--tw-border-spacing-x) 0.875rem; |
| border-spacing-4 | border-spacing: 1rem 1rem; |
| border-spacing-x-4 | border-spacing: 1rem var(--tw-border-spacing-y); |
| border-spacing-y-4 | border-spacing: var(--tw-border-spacing-x) 1rem; |
| border-spacing-5 | border-spacing: 1.25rem 1.25rem; |
| border-spacing-x-5 | border-spacing: 1.25rem var(--tw-border-spacing-y); |
| border-spacing-y-5 | border-spacing: var(--tw-border-spacing-x) 1.25rem; |
| border-spacing-6 | border-spacing: 1.5rem 1.5rem; |
| border-spacing-x-6 | border-spacing: 1.5rem var(--tw-border-spacing-y); |
| border-spacing-y-6 | border-spacing: var(--tw-border-spacing-x) 1.5rem; |
| border-spacing-7 | border-spacing: 1.75rem 1.75rem; |
| border-spacing-x-7 | border-spacing: 1.75rem var(--tw-border-spacing-y); |
| border-spacing-y-7 | border-spacing: var(--tw-border-spacing-x) 1.75rem; |
| border-spacing-8 | border-spacing: 2rem 2rem; |
| border-spacing-x-8 | border-spacing: 2rem var(--tw-border-spacing-y); |
| border-spacing-y-8 | border-spacing: var(--tw-border-spacing-x) 2rem; |
| border-spacing-9 | border-spacing: 2.25rem 2.25rem; |
| border-spacing-x-9 | border-spacing: 2.25rem var(--tw-border-spacing-y); |
| border-spacing-y-9 | border-spacing: var(--tw-border-spacing-x) 2.25rem; |
| border-spacing-10 | border-spacing: 2.5rem 2.5rem; |
| border-spacing-x-10 | border-spacing: 2.5rem var(--tw-border-spacing-y); |
| border-spacing-y-10 | border-spacing: var(--tw-border-spacing-x) 2.5rem; |
| border-spacing-11 | border-spacing: 2.75rem 2.75rem; |
| border-spacing-x-11 | border-spacing: 2.75rem var(--tw-border-spacing-y); |
| border-spacing-y-11 | border-spacing: var(--tw-border-spacing-x) 2.75rem; |
| border-spacing-12 | border-spacing: 3rem 3rem; |
| border-spacing-x-12 | border-spacing: 3rem var(--tw-border-spacing-y); |
| border-spacing-y-12 | border-spacing: var(--tw-border-spacing-x) 3rem; |
| border-spacing-14 | border-spacing: 3.5rem 3.5rem; |
| border-spacing-x-14 | border-spacing: 3.5rem var(--tw-border-spacing-y); |
| border-spacing-y-14 | border-spacing: var(--tw-border-spacing-x) 3.5rem; |
| border-spacing-16 | border-spacing: 4rem 4rem; |
| border-spacing-x-16 | border-spacing: 4rem var(--tw-border-spacing-y); |
| border-spacing-y-16 | border-spacing: var(--tw-border-spacing-x) 4rem; |
| border-spacing-20 | border-spacing: 5rem 5rem; |
| border-spacing-x-20 | border-spacing: 5rem var(--tw-border-spacing-y); |
| border-spacing-y-20 | border-spacing: var(--tw-border-spacing-x) 5rem; |
| border-spacing-24 | border-spacing: 6rem 6rem; |
| border-spacing-x-24 | border-spacing: 6rem var(--tw-border-spacing-y); |
| border-spacing-y-24 | border-spacing: var(--tw-border-spacing-x) 6rem; |
| border-spacing-28 | border-spacing: 7rem 7rem; |
| border-spacing-x-28 | border-spacing: 7rem var(--tw-border-spacing-y); |
| border-spacing-y-28 | border-spacing: var(--tw-border-spacing-x) 7rem; |
| border-spacing-32 | border-spacing: 8rem 8rem; |
| border-spacing-x-32 | border-spacing: 8rem var(--tw-border-spacing-y); |
| border-spacing-y-32 | border-spacing: var(--tw-border-spacing-x) 8rem; |
| border-spacing-36 | border-spacing: 9rem 9rem; |
| border-spacing-x-36 | border-spacing: 9rem var(--tw-border-spacing-y); |
| border-spacing-y-36 | border-spacing: var(--tw-border-spacing-x) 9rem; |
| border-spacing-40 | border-spacing: 10rem 10rem; |
| border-spacing-x-40 | border-spacing: 10rem var(--tw-border-spacing-y); |
| border-spacing-y-40 | border-spacing: var(--tw-border-spacing-x) 10rem; |
| border-spacing-44 | border-spacing: 11rem 11rem; |
| border-spacing-x-44 | border-spacing: 11rem var(--tw-border-spacing-y); |
| border-spacing-y-44 | border-spacing: var(--tw-border-spacing-x) 11rem; |
| border-spacing-48 | border-spacing: 12rem 12rem; |
| border-spacing-x-48 | border-spacing: 12rem var(--tw-border-spacing-y); |
| border-spacing-y-48 | border-spacing: var(--tw-border-spacing-x) 12rem; |
| border-spacing-52 | border-spacing: 13rem 13rem; |
| border-spacing-x-52 | border-spacing: 13rem var(--tw-border-spacing-y); |
| border-spacing-y-52 | border-spacing: var(--tw-border-spacing-x) 13rem; |
| border-spacing-56 | border-spacing: 14rem 14rem; |
| border-spacing-x-56 | border-spacing: 14rem var(--tw-border-spacing-y); |
| border-spacing-y-56 | border-spacing: var(--tw-border-spacing-x) 14rem; |
| border-spacing-60 | border-spacing: 15rem 15rem; |
| border-spacing-x-60 | border-spacing: 15rem var(--tw-border-spacing-y); |
| border-spacing-y-60 | border-spacing: var(--tw-border-spacing-x) 15rem; |
| border-spacing-64 | border-spacing: 16rem 16rem; |
| border-spacing-x-64 | border-spacing: 16rem var(--tw-border-spacing-y); |
| border-spacing-y-64 | border-spacing: var(--tw-border-spacing-x) 16rem; |
| border-spacing-72 | border-spacing: 18rem 18rem; |
| border-spacing-x-72 | border-spacing: 18rem var(--tw-border-spacing-y); |
| border-spacing-y-72 | border-spacing: var(--tw-border-spacing-x) 18rem; |
| border-spacing-80 | border-spacing: 20rem 20rem; |
| border-spacing-x-80 | border-spacing: 20rem var(--tw-border-spacing-y); |
| border-spacing-y-80 | border-spacing: var(--tw-border-spacing-x) 20rem; |
| border-spacing-96 | border-spacing: 24rem 24rem; |
| border-spacing-x-96 | border-spacing: 24rem var(--tw-border-spacing-y); |
| border-spacing-y-96 | border-spacing: var(--tw-border-spacing-x) 24rem; |