preloader style : demo 159

                        .demo{ background: #7cafaf; }
                        .loader{
                            width: 300px;
                            height: 180px;
                            margin: 40px auto;
                            position: relative;
                        }
                        .loader .loader-inner{
                            border-radius: 2px;
                            background: linear-gradient(to bottom, transparent, rgba(0,0,0,.1));
                            position: absolute;
                            -webkit-animation: loading-1 1s ease infinite;
                            animation: loading-1 1s ease infinite;
                        }
                        .loader .loader-inner:nth-child(1){ left: 0; }
                        .loader .loader-inner:nth-child(2){
                            left: 40px;
                            animation-delay: .1s;
                        }
                        .loader .loader-inner:nth-child(3){
                            left: 80px;
                            animation-delay: .2s;
                        }
                        .loader .loader-inner:nth-child(4){
                            left: 120px;
                            animation-delay: .3s;
                        }
                        .loader .loader-inner:nth-child(5){
                            left: 160px;
                            animation-delay: .4s;
                        }
                        .loader .loader-inner:nth-child(6){
                            left: 200px;
                            animation-delay: .5s;
                        }
                        .loader .loader-inner:nth-child(7){
                            left: 240px;
                            animation-delay: .6s;
                        }
                        .loader .loader-inner:nth-child(8){
                            left: 280px;
                            animation-delay: .7s;
                        }
                        @-webkit-keyframes loading-1{
                            0%{
                                width: 20px;
                                height: 180px;
                                margin-top: 0;
                                margin-left: 0;
                                box-shadow: inset 0 1px 1px rgba(255,255,255,.2), 0 2px 2px rgba(0,0,0,.7);
                            }
                            50%{
                                width: 26px;
                                height: 200px;
                                margin-left: -3px;
                                margin-top:-10px;
                                box-shadow: inset 0 1px 1px rgba(255,255,255,.2), 0 20px 25px rgba(0,0,0,.7);
                            }
                            100%{
                                width: 20px;
                                height: 180px;
                                margin-left: 0;
                                margin-top: 0;
                                box-shadow: inset 0 1px 1px rgba(255,255,255,.2), 0 2px 2px rgba(0,0,0,.7);
                            }
                        }
                        @keyframes loading-1{
                            0%{
                                width: 20px;
                                height: 180px;
                                margin-top: 0;
                                margin-left: 0;
                                box-shadow: inset 0 1px 1px rgba(255,255,255,.2), 0 2px 2px rgba(0,0,0,.7);
                            }
                            50%{
                                width: 26px;
                                height: 200px;
                                margin-left: -3px;
                                margin-top:-10px;
                                box-shadow: inset 0 1px 1px rgba(255,255,255,.2), 0 20px 25px rgba(0,0,0,.7);
                            }
                            100%{
                                width: 20px;
                                height: 180px;
                                margin-left: 0;
                                margin-top: 0;
                                box-shadow: inset 0 1px 1px rgba(255,255,255,.2), 0 2px 2px rgba(0,0,0,.7);
                            }
                        }