switch滑动切换按钮样式

<input class="mui-switch mui-switch-animbg" ng-checked="checked==true" ng-click="switchTab()" type="checkbox">

.mui-switch {
    width: 40px;
    height: 20px;
    position: relative;
    border: 1px solid #dfdfdf;
    background-color: #fdfdfd;
    box-shadow: #dfdfdf 0 0 0 0 inset;
    border-radius: 20px;
    /* background-clip: content-box; */
    display: inline-block;
    -webkit-appearance: none;
    user-select: none;
    outline: none;
}
.mui-switch:before {
    content: '';
    width: 19px;
    height: 19px;
    position: absolute;
    top: 0px;
    left: 0;
    border-radius: 20px;
    background-color: #fff;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
}
.mui-switch:checked {
    border-color: #fd5454;
    box-shadow: #fd5454 0 0 0 16px inset;
    background-color: #fd5454;
}
.mui-switch:checked:before {
    left: 19px;
}
.mui-switch.mui-switch-animbg {
    transition: background-color ease 0.4s;
}
.mui-switch.mui-switch-animbg:before {
    transition: left 0.3s;
}
.mui-switch.mui-switch-animbg:checked {
    box-shadow: #fd5454 0 0 0 0 inset;
    background-color: #fd5454;
    transition: border-color 0.4s, background-color ease 0.4s;
}

$scope.checked = false
$scope.switchTab = function (){
   $scope.checked = !$scope.checked
}