添加back to top图标

@@ -5,7 +5,7 @@
             Back to top
             <i class="iconfont">&#xe608;</i>
         </span>
-        <div class="float-top ">Top</div>
+        <div class="float-top "></div>
     </p>
     <address class="copyright">
         CopyRight©2007-2016 南京新与力文化传播有限公司

@@ -63,6 +63,34 @@
             margin: 0 0.3em;
         }
     }
+    .float-top {
+        position: absolute;
+        top: 47px;
+        right: 47px;
+        left: initial;
+        bottom: initial;
+        border-radius: 50%;
+        width: 90px;
+        height: 90px;
+        background: resolve("product/back-to-top.png") no-repeat;
+        -webkit-background-size: cover;
+        background-size: cover;
+        display: none;
+        transition: transform 0.5s;
+        -webkit-transition: transform 0.5s;
+        &.hover {
+            position: fixed;
+            top: initial;
+            left: initial;
+            right: 24px;
+            bottom: 147px;
+            z-index: 9999;
+            display: block;
+        }
+        &.animation {
+            
+        }
+    }
 
     .copyright {
         height: 120px;

@@ -911,30 +911,3 @@ $basicBtnC: #eb0313;
 iframe {
     display: none;
 }
-.float-top {
-    position: absolute;
-    top: 47px;
-    right: 47px;
-    left: initial;
-    bottom: initial;
-    border-radius: 50%;
-    color: #fff;
-    width: 50px;
-    height: 50px;
-    background-color: rgba(0,0,0,0.7);
-    display: none;
-    transition: transform 0.5s;
-    -webkit-transition: transform 0.5s;
-    &.hover {
-        position: fixed;
-        top: initial;
-        left: initial;
-        right: 47px;
-        bottom: 250px;
-        z-index: 9999;
-        display: block;
-    }
-    &.animation {
-        
-    }
-}
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