feat: 相关商品样式调整

src/static/scss/box-sizing.scss

@@ -0,0 +1,3 @@
+.border-box {
+  box-sizing: border-box;
+}

src/static/scss/index.scss

@@ -19,3 +19,4 @@
 @import "./width.scss";
 @import "./z-index.scss";
 @import "./white-space.scss";
+@import "./box-sizing.scss";

src/static/scss/position.scss

@@ -6,3 +6,15 @@
 .absolute {
   position: absolute;
 }
+
+.left-0 {
+  left: 0;
+}
+
+.right-0 {
+  right: 0;
+}
+
+.bottom-0 {
+  bottom: 0;
+}