box-sizing CSS3box-sizing プロパティbox-sizingCSS3CSS3 [CSS] Box Modelbox-sizingBox ModelwebCSSwidthheightfrontendborderradiusTILpaddingmargin box-sizingbox-sizing
CSS3box-sizing プロパティbox-sizingCSS3CSS3 [CSS] Box Modelbox-sizingBox ModelwebCSSwidthheightfrontendborderradiusTILpaddingmargin box-sizingbox-sizing