@import url(https://fonts.googleapis.com/css?family=opensans:500);
body{
                background: #33cc99;
                color:#fff;
                font-family: 'Open Sans', sans-serif;
                max-height:700px;
                overflow: hidden;
            }
            .c{
                text-align: center;
                display: block;
                position: relative;
                width:80%;
                margin: auto;
            }
            ._503{
                font-size: 160px;
                position: relative;
                display: inline-block;
                z-index: 2;
                height: 160px;
                letter-spacing: 15px;
            }
            .hr{
                height: 4px;
                background-color: #ffffff;
                border: none;
            }
            ._1{
                text-align:center;
                display:block;
                position:relative;
                letter-spacing: 12px;
                font-size: 2.5em;
                line-height: 80%;
            }
            ._2{
                text-align:center;
                display:block;
                position: relative;
                font-size: 20px;
            }
            .btn{
                background-color: rgb( 255, 255, 255 );
                position: relative;
                display: inline-block;
                width: 358px;
                padding: 5px;
                z-index: 5;
                font-size: 25px;
                margin: 20px auto;
                color:#33cc99;
                text-decoration: none;
                margin-right: 10px
            }
            .article{
                margin-left: 10%;
                margin-right: 10%;
            }
            
            .cloud {
                width: 350px; height: 120px;

                background: #FFF;
                background: linear-gradient(top, #FFF 100%);
                background: -webkit-linear-gradient(top, #FFF 100%);
                background: -moz-linear-gradient(top, #FFF 100%);
                background: -ms-linear-gradient(top, #FFF 100%);
                background: -o-linear-gradient(top, #FFF 100%);

                border-radius: 100px;
                -webkit-border-radius: 100px;
                -moz-border-radius: 100px;

                position: absolute;
                margin: 120px auto 20px;
                z-index:-1;
                transition: ease 1s;
            }

            .cloud:after, .cloud:before {
                content: '';
                position: absolute;
                background: #FFF;
                z-index: -1
            }

            .cloud:after {
                width: 100px; height: 100px;
                top: -50px; left: 50px;

                border-radius: 100px;
                -webkit-border-radius: 100px;
                -moz-border-radius: 100px;
            }

            .cloud:before {
                width: 180px; height: 180px;
                top: -90px; right: 50px;

                border-radius: 200px;
                -webkit-border-radius: 200px;
                -moz-border-radius: 200px;
            }
            
            .x1 {
                top:-100px;
                left:100px;
                -webkit-transform: scale(0.3);
                -moz-transform: scale(0.3);
                transform: scale(0.3);
                opacity: 0.65;
                -webkit-animation: moveclouds 15s linear infinite;
                -moz-animation: moveclouds 15s linear infinite;
                -o-animation: moveclouds 15s linear infinite;
            }
            
            .x1_5{
                top:-80px;
                left:250px;
                -webkit-transform: scale(0.3);
                -moz-transform: scale(0.3);
                transform: scale(0.3);
                opacity: 0.85;
                -webkit-animation: moveclouds 17s linear infinite;
                -moz-animation: moveclouds 17s linear infinite;
                -o-animation: moveclouds 17s linear infinite; 
            }

            .x2 {
                left: 250px;
                top:0px;
                -webkit-transform: scale(0.6);
                -moz-transform: scale(0.6);
                transform: scale(0.6);
                opacity: 0.6; 
                -webkit-animation: moveclouds 25s linear infinite;
                -moz-animation: moveclouds 25s linear infinite;
                -o-animation: moveclouds 25s linear infinite;
            }

            .x3 {
                left: 250px; top : 20px;

                -webkit-transform: scale(0.9);
                -moz-transform: scale(0.9);
                transform: scale(0.9);
                opacity: 0.8; 

                -webkit-animation: moveclouds 70s linear infinite;
                -moz-animation: moveclouds 70s linear infinite;
                -o-animation: moveclouds 70s linear infinite;
            }

            .x4 {
                left: 470px; top: 100px;

                -webkit-transform: scale(0.75);
                -moz-transform: scale(0.75);
                transform: scale(0.75);
                opacity: 0.75;

                -webkit-animation: moveclouds 18s linear infinite;
                -moz-animation: moveclouds 18s linear infinite;
                -o-animation: moveclouds 18s linear infinite;
            }

            .x5 {
                left: 200px; top: 200px;

                -webkit-transform: scale(0.5);
                -moz-transform: scale(0.5);
                transform: scale(0.5);
                opacity: 0.8; 

                -webkit-animation: moveclouds 20s linear infinite;
                -moz-animation: moveclouds 20s linear infinite;
                -o-animation: moveclouds 20s linear infinite;
            }

            @-webkit-keyframes moveclouds {
                0% {margin-left: 1000px;}
                100% {margin-left: -1000px;}
            }
            @-moz-keyframes moveclouds {
                0% {margin-left: 1000px;}
                100% {margin-left: -1000px;}
            }
            @-o-keyframes moveclouds {
                0% {margin-left: 1000px;}
                100% {margin-left: -1000px;}
            }