/* LianDong buttons css */
        circle:hover {
            stroke: salmon;
            stroke-width: 5px;
            transition: 100ms;
        }

        #lianDongButton {
            background-color: rgba(0, 0, 0, 0.2);
            border: none;
            border-radius: 0.8em;
            color: white;
            padding: 20px;
            width: 100px;
            text-align: center;
            -webkit-transition-duration: 0.4s; 
            transition-duration: 0.4s;
            text-decoration: none;
            overflow: hidden;
            cursor: pointer;
            font-size: 12px;
        }

        #lianDongButton:after {
            content: "";
            background: #f1f1f1;
            display: block;
            padding-top: 300%;
            padding-left: 350%;
            margin-left: -20px !important;
            margin-top: -120%;
            opacity: 0;
            transition: all 0.8s
        }

        #lianDongButton:active:after {
            padding: 0;
            margin: 0;
            opacity: 1;
            transition: 0s;
        }