preloader style : demo 222

                        .loader{
                            width: 200px;
                            height: 100px;
                            margin: 0 auto;
                            position: relative;
                        }
                        .loader:after{
                            content: "";
                            width: 2px;
                            height: 100px;
                            margin-left: -1px;
                            border-left: 2px dotted #000;
                            position: absolute;
                            left: 50%;
                            z-index: 1;
                        }
                        .loader-box-left,
                        .loader-box-right{
                            width: 100px;
                            height: 100px;
                            overflow: hidden;
                            position: absolute;
                            top: 0;
                            left: 0;
                            z-index: 2;
                        }
                        .loader-box-right{
                            left: auto;
                            right: 0
                        }
                        .loader-circle-left,
                        .loader-circle-right{
                            background: #e74c3c;
                            width: 75px;
                            height: 75px;
                            margin-top: -37.5px;
                            border-radius: 50%;
                            border: 2px solid #000;
                            position: absolute;
                            top: 50%;
                            right: 10px;
                            z-index: 3;
                            animation: leftAnim 1.3s ease-in-out alternate infinite;
                        }
                        .loader-circle-right{
                            background: #8e44ad;
                            right: auto;
                            left: 10px;
                            z-index: 2;
                            animation: rightAnim 1.3s ease-in-out alternate infinite;
                        }
                         @keyframes leftAnim{
                            0%{ transform: translateX(97px); }
                            100%{ transform: translateX(0); }
                        }
                         @keyframes rightAnim{
                            0%{ transform: translateX(0); }
                            100%{ transform: translateX(-93px); }
                        }