CSS3:border
border
CSS3:ボーダー
border-bottom
border-bottom-color
border-bottom-left-radius
border-bottom-right-radius
border-bottom-style
border-bottom-width
border-color
border-image
border-image-outset
border-image-repeat
border-image-slice
border-image-source
border-image-width
border-left
border-left-color
border-left-style
border-left-width
border-radius
border-right
border-right-color
border-right-style
border-right-width
border-style
border-top
border-top-color
border-top-left-radius
border-top-right-radius
border-top-style
border-top-width
https://developer.mozilla.org/en-US/docs/Web/CSS/border
CSS3-property.icon
https://img.shields.io/badge/CSS3-border-1572B6.svg?logo=css3&style=for-the-badge