[Layout] import breakpoint and @include sm

Try to follow new scss and make it RWD.

src/assets/scss/CFP/intro.scss

@@ -1,3 +1,4 @@
+@import '../hyperpoint';
 $fontFamily: Noto Sans TC;
 $fontColor:  #226BB4;
 
@@ -89,6 +90,7 @@ $fontColor:  #226BB4;
 
     .past-sitcon {
       margin-bottom: 2em;
+      width: 700px;
 
       .thumbnails {
         display: flex;
@@ -182,7 +184,64 @@ $fontColor:  #226BB4;
         font-weight: 900;
         font-size: 1.25em;
         margin-bottom: 0.5em;
-        
+      }
+    }
+  }
+}
+
+@include sm {
+  #cfp-intro{
+    h1,
+    h2,
+    h3 {
+      margin-bottom: 10pt;
+    }
+
+    p {
+      font-size: 12pt;
+      line-height: 1.85;
+      width:75vw;
+    }
+
+    p:not(:last-child) {
+      margin-bottom: 2em;
+    }
+  }
+
+  #cfp-intro{
+    .box-back {
+      margin-bottom: -45em;
+      margin-left:-4em;
+  
+      .first-box {
+        transform: rotate(12deg) scale(0.9);
+        bottom: 640px;
+        left: -20px;
+      }
+      .introd-text {
+        top: 100px;
+      }
+      .past-sitcon {
+        margin-top:1em;
+      }
+    }
+  }
+
+  #cfp-intro{
+    .box-bluearea {
+      height: 280px;
+      z-index: 0;
+      transform: rotate(12deg);
+    }
+  }
+  
+  #cfp-intro{
+    .box-back2 {
+      margin-top:3em;
+  
+      .second-box {
+          transform: rotate(12deg);
+          bottom: 1100px;
       }
     }
   }