preloader style : demo 234

HTML

                        

CSS

                        .loader{
                            --size: 32px;
                            --duration: 800ms;
                            width: 96px;
                            height: 64px;
                            margin: 50px auto;
                            transform-style: preserve-3d;
                            transform-origin: 50% 50%;
                            transform: rotateX(60deg) rotateZ(45deg) rotateY(0deg) translateZ(0px);
                            position: relative;
                        }
                        .loader .box{
                            width:  32px;
                            height: 32px;
                            transform-style: preserve-3d;
                            position: absolute;
                            top: 0;
                            left: 0;
                        }
                        .loader .box:nth-child(1){
                            transform: translate(100%, 0);
                            animation: box1 800ms linear infinite;
                        }
                        .loader .box:nth-child(2){
                            transform: translate(0, 100%);
                            animation: box2 800ms linear infinite;
                        }
                        .loader .box:nth-child(3){
                            transform: translate(100%, 100%);
                            animation: box3 800ms linear infinite;
                        }
                        .loader .box:nth-child(4){
                            transform: translate(200%, 0);
                            animation: box4 800ms linear infinite;
                        }
                        .loader .box > div{
                            --translateZ: calc(var(--size) / 2);
                            --rotateY: 0deg;
                            --rotateX: 0deg;
                            background: #5c8df6;
                            width: 100%;
                            height: 100%;
                            transform: rotateY(var(--rotateY)) rotateX(var(--rotateX)) translateZ(var(--translateZ));
                            position: absolute;
                            top: auto;
                            right: auto;
                            bottom: auto;
                            left: auto;
                        }
                        .loader .box > div:nth-child(1){
                            top: 0;
                            left: 0;
                        }
                        .loader .box > div:nth-child(2){
                            background: #145af2;
                            right: 0;
                            --rotateY: 90deg;
                        }
                        .loader .box > div:nth-child(3){
                            background: #447cf5;
                            --rotateX: -90deg;
                        }
                        .loader .box > div:nth-child(4){
                            background: #dbe3f4;
                            top: 0;
                            left: 0;
                            --translateZ: calc(var(--size) * 3 * -1);
                        }
                        @keyframes box1{
                            0%, 50%{ transform: translate(100%, 0); }
                            100%{ transform: translate(200%, 0); }
                        }
                        @keyframes box2{
                            0%{ transform: translate(0, 100%); }
                            50%{ transform: translate(0, 0); }
                            100%{ transform: translate(100%, 0); }
                        }
                        @keyframes box3{
                            0%, 50%{ transform: translate(100%, 100%); }
                            100%{ transform: translate(0, 100%); }
                        }
                        @keyframes box4{
                            0%{ transform: translate(200%, 0); }
                            50%{ transform: translate(200%, 100%); }
                            100%{ transform: translate(100%, 100%); }
                        }
                    
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