preloader style : demo 224

                        .loader{
                            width: 140px;
                            height: 100px;
                            margin: 50px auto 0;
                            position: relative;
                        }
                        .loader .box{
                            background: linear-gradient(to right,#38ef7d,#11998e);
                            width: 50px;
                            height: 10px;
                            box-shadow: 2px 2px 3px 0px #000;
                            position: absolute;
                            top: 50%;
                        }
                        .loader .box1{
                            left: 80px;
                            animation: dominos 1s 0.125s ease infinite;
                        }
                        .loader .box2{
                            left: 70px;
                            animation: dominos 1s 0.3s ease infinite;
                        }
                        .loader .box3{
                            left: 60px;
                            animation: dominos 1s 0.425s ease infinite;
                        }
                        .loader .box4{
                            left: 50px;
                            animation: dominos 1s 0.540s ease infinite;
                        }
                        .loader .box5{
                            left: 40px;
                            animation: dominos 1s 0.665s ease infinite;
                        }
                        .loader .box6{
                            left: 30px;
                            animation: dominos 1s 0.79s ease infinite;
                        }
                        .loader .box7{
                            left: 20px;
                            animation: dominos 1s 0.9s ease infinite;
                        }
                        .loader .box8{
                            left: 10px;
                            animation: dominos 1s 1s ease infinite;
                        }
                        @keyframes  dominos{
                            50%{ opacity: 0.7; }
                            75%{ transform: rotate(90deg); }
                            80%{ opacity: 1; }
                        }