全部是按照老师所讲的敲得代码，为何打开后浏览器不显示侧栏，谁帮我看一下啊谢谢
.toolbar-layer, .toolbar-item {
background-image: url(../img/toolbar.png);
background-repeat: no-repeat;
}
.toolbar {
position: fixed;
left: 50%;
bottom: 5px;
margin-left: -26px;
}
.toolbar-item {
position: relative;
display: block;
width: 52px;
height: 52px;
margin-top: 1px;
-webkit-transition: background-position 1s;
-moz-transition: background-position 1s;
-ms-transition: background-position 1s;
-o-transition: background-position 1s;
transition: background-position 1s;
}
.toolbar-item:hover .toolbar-layer {
opacity: 1;
filter: alpha(opacity=100);
-webkit-transform: scale(1);
-moz-transform: scale(1);
-ms-transform: scale(1);
-o-transform: scale(1);
transform: scale(1);
}
.toolbar-layer {
position: absolute;
right: 46px;
bottom: -10px;
width: 172px;
opacity: 0;
filter: alpha(opacity=0);
-webkit-transform-origin: 95% 95%;
-moz-transform-origin: 95% 95%;
-ms-transform-origin: 95% 95%;
-o-transform-origin: 95% 95%;
transform-origin: 95% 95%;
-webkit-transform: scale(0.01);
-moz-transform: scale(0.01);
-ms-transform: scale(0.01);
-o-transform: scale(0.01);
transform: scale(0.01);
-webkit-transition: all 500ms;
-moz-transition: all 500ms;
-ms-transition: all 500ms;
-o-transition: all 500ms;
transition: all 500ms;
}
.toolbar-item-weixin {
background-position: 798px;
}
.toolbar-item-weixin:hover {
background-position: 0 -860px;
}
.toolbar-item-weixin .toolbar-layer {
height: 212px;
background-position: 0 0;
}
.toolbar-item-feedback {
background-position: 426px;
}
.toolbar-item-feedback:hover {
background-position: 0 -488px;
}
.toolbar-item-app {
background-position: 550px;
}
.toolbar-item-app:hover {
background-position: 0 -612px;
}
.toolbar-item-app .toolbar-layer {
height: 194px;
background-position: 0 -222px;
}
.toolbar-item-top {
background-position: 674px;
}
.toolbar-item-top:hover {
background-position: 0 -736px;
}
