为什么我的二维码图片不显示

@import "mixin";
@font-face {
    font-family: 'icomoon';
    src:    url('fonts/icomoon.eot?yjahb8');
    src:    url('fonts/icomoon.eot?yjahb8#iefix') format('embedded-opentype'),
        url('fonts/icomoon.ttf?yjahb8') format('truetype'),
        url('fonts/icomoon.woff?yjahb8') format('woff'),
        url('fonts/icomoon.svg?yjahb8#icomoon') format('svg');
    font-weight: normal;
    font-style: normal;
}

[class^="icon-"], [class*=" icon-"] {
    /* use !important to prevent issues with browser extensions that change fonts */
    font-family: 'icomoon' !important;
    speak: none;
    font-style: normal;
    font-weight: normal;
    font-variant: normal;
    text-transform: none;
    line-height: 1;

    /* Better Font Rendering =========== */
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.icon-message-typing:before {
    content: "\e900";
}
.icon-align-top:before {
    content: "\e901";
}
.icon-wechat:before {
    content: "\e902";
}
.icon-mobile2:before {
    content: "\e959";
}
$toolbar-size:52px;
.toolbar{
    position:fixed;
    left:50%;
    bottom:5px;
    margin-left:-$toolbar-size / 2;
}
.toolbar-item{
    position:relative;
    display:block;
    width:$toolbar-size;
    height:$toolbar-size;
    margin-top:1px;
    &:hover{
        .toolbar-icon{
           top:-$toolbar-size;
        }
        .toolbar-text{
           top:0;
        }
        .toolbar-layer{
          @include opacity(1);
          @include scale(1);
        }
    }
}
.toolbar-btn{
    position:absolute;
    left:0;
    top:0;
    width:$toolbar-size;
    height:$toolbar-size;
    overflow:hidden;
}
.toolbar-icon{
    position:absolute;
    left:0;
    top:0;
    width:$toolbar-size;
    height:$toolbar-size;
    background-color:#d0d6d9;
    font-size:30px;
    color:#fff;
    text-align:center;
    line-height:$toolbar-size;
    @include transition(top 1s);
}
.toolbar-text{
     position:absolute;
    left:0;
    top:$toolbar-size;
    width:$toolbar-size;
    height:$toolbar-size;
    background-color:#98a1a6;
    font-size:12px;
    color:#fff;
    text-align:center;
    line-height:1.2;
    padding-top:12px;
    @include transition(top 1s);
}
.toolbar-layer{
   position:absolute;
    right:$toolbar-size - 6;
    bottom:-10px;
    width:172px;
  @include opacity(0);
  @include transform-origin(95% 95%);
  @include scale(0.01);
  @include transition(all 1s);
    background-image:url(../img/toolbar_img.png);
    background-repeat:no-repeat;
}
.toolbar-layer-weixin{
    height:212px;
        background-position:0 0;
}
.toolbar-layer-app{
    height:194px;
        background-position:0 -222px;
}