label::after{
        content: "点击收藏";
    }

    body{
        height: 70vh;
        display: flex;
        justify-content: center;
        align-items: center;
        background: #222222;
    }

    label{
        /* border: 1px red solid; */
        position:relative;
    }
    label::before{
        content: "";
        position:absolute;
        box-sizing: border-box;
        width: 100%;
        height: 100%;
        border-radius: 50%;
        border: 30px gold solid;
        z-index: -1;
        transform: scale(0);
    }
    label::after{
        content: "点击收藏";
        position: absolute;
        width: 100%;
        color: silver;
        font-size: 36px;
        text-align: center;
    }
    label svg{
        fill: silver;
    }
    #fav-btn{
        display: none;
    }

    /* 星星动画 */
    @keyframes star{
        0%{
            fill: silver;
           transform: scale(1); 
        }
        20%{
            fill: gold;
            transform: scale(0); 
        }
        30%{
            transform: scale(1.2); 
        }
        40%{
            transform: scale(1); 
        }
        50%{
            transform: scale(.8); 
        }
        75%{
            transform: scale(1); 
        }
        90%{
            transform: scale(.9); 
        }
        100%{
            fill: gold;
            transform: scale(1); 
        }
    }
    /* 当input控件被选中状态时（点击），动画才执行 */
    #fav-btn:checked + label svg{
        animation: star 1.5s forwards ease-in;
    }

    @keyframes circle{
        from{
            transform: scale(0);
            border-width: 30px;
        }
        to{
            transform: scale(1.3);
            border-width: 0px;
        }

    }


    #fav-btn:checked + label::before{
        animation: circle .6s;
    }


    #fav-btn:checked + label::after{
        content: "已收藏";
        color: gold;
    }