           content: " ";
                width: 20px;
                height: 20px;
                background: #2196f3;
                border-radius: 100%;
                position: absolute;
                animation: shift 2s linear infinite;
            }
            .loader > div:nth-of-type(1) {
                animation-delay: -0.4s;
            }
            .loader > div:nth-of-type(2) {
                animation-delay: -0.8s;
            }
            .loader > div:nth-of-type(3) {
