jquery - Css3 中的云动画循环

Question

我的css3动画效果有问题。作为一个例子。这朵云一直动画到 7 秒，7 秒后，它又回到起点并再次动画。但是当它到达起点时，它显示像云回来并开始动画。我想停止那个东西并且只连续地向一个方向动画。谁能帮忙？

Fiddle demo

CSS3

.sky {
        height:638px;
        background:#007fd5;
        position:relative;
        overflow:hidden;
        -webkit-animation:sky_background 50s ease-out infinite;
        -moz-animation:sky_background 50s ease-out infinite;
        -o-animation:sky_background 50s ease-out infinite;
        -webkit-transform:translate3d(0,0,0);
        -moz-transform:translate3d(0,0,0);
        -o-transform:translate3d(0,0,0)
    }


    .moon {
        background:url("http://montanaflynn.me/lab/css-clouds/images/moon.png");
        position:absolute;
        left:0;
        height:85%;
        width:300%;
        -webkit-animation:moon 50s linear infinite;
        -moz-animation:moon 50s linear infinite;
        -o-animation:moon 50s linear infinite;
        -webkit-transform:translate3d(0,0,0);
        -moz-transform:translate3d(0,0,0);
        -o-transform:translate3d(0,0,0)
    }


    .clouds_one {
          margin-top: -55px;
        background:url("http://montanaflynn.me/lab/css-clouds/images/cloud_one.png");
        position:absolute;
        left:0;
        top:0;
        height:80%;
        width:400%;
        -webkit-animation:cloud_one 3s linear infinite;
        -moz-animation:cloud_one 3s linear infinite;
        -o-animation:cloud_one 3s linear infinite;
        -webkit-transform:translate3d(0,0,0);
        -moz-transform:translate3d(0,0,0);
        -o-transform:translate3d(0,0,0)
    }

    .clouds_two {
        background:url("http://montanaflynn.me/lab/css-clouds/images/cloud_two.png");
        position:absolute;
        left:0;
        top:0;
        height:80%;
        width:400%;
        -webkit-animation:cloud_two 4s linear infinite;
        -moz-animation:cloud_two 4s linear infinite;
        -o-animation:cloud_two 4s linear infinite;
        -webkit-transform:translate3d(0,0,0);
        -moz-transform:translate3d(0,0,0);
        -o-transform:translate3d(0,0,0)
    }

    .clouds_three {

        background:url("http://montanaflynn.me/lab/css-clouds/images/cloud_three.png");
        position:absolute;
        left:0;
        top:0;
        height:75%;
        width:400%;
        -webkit-animation:cloud_three 7s linear infinite;
        -moz-animation:cloud_three 7s linear infinite;
        -o-animation:cloud_three 7s linear infinite;
        -webkit-transform:translate3d(0,0,0);
        -moz-transform:translate3d(0,0,0);
        -o-transform:translate3d(0,0,0)
    }

    @-webkit-keyframes sky_background {
        0% {
            background:#007fd5;
            color:#007fd5
        }

        50% {
            background:#007fd5;
            color:#007fd5
        }

        100% {
            background:#007fd5;
            color:#007fd5
        }
    }

    @-webkit-keyframes moon {
        0% {
            opacity: 0;
            left:-200%
            -moz-transform: scale(0.5);
            -webkit-transform: scale(0.5);
        }

        50% {
            opacity: 1;
            -moz-transform: scale(1);
            left:0%
            bottom:250px;
            -webkit-transform: scale(1);
        }

        100% {
            opacity: 0;
            bottom:500px;
            -moz-transform: scale(0.5);
            -webkit-transform: scale(0.5);
        }
    }

    @-webkit-keyframes cloud_one {
        0% {
            left:0
        }

        100% {
            left:-200%
        }
    }

    @-webkit-keyframes cloud_two {
        0% {
            left:0
        }

        100% {
            left:-200%
        }
    }

    @-webkit-keyframes cloud_three {
        0% {
            left:0
        }

        100% {
            left:-200%
        }
    }

    @-moz-keyframes sky_background {
        0% {
            background:#007fd5;
            color:#007fd5
        }

        50% {
            background:#000;
            color:#a3d9ff
        }

        100% {
            background:#007fd5;
            color:#007fd5
        }
    }

    @-moz-keyframes moon {
        0% {
            opacity: 0;
            left:-200%
            -moz-transform: scale(0.5);
            -webkit-transform: scale(0.5);
        }

        50% {
            opacity: 1;
            -moz-transform: scale(1);
            left:0%
            bottom:250px;
            -webkit-transform: scale(1);
        }

        100% {
            opacity: 0;
            bottom:500px;
            -moz-transform: scale(0.5);
            -webkit-transform: scale(0.5);
        }
    }

    @-moz-keyframes cloud_one {
        0% {
            left:0
        }

        100% {
            left:-200%
        }
    }

    @-moz-keyframes cloud_two {
        0% {
            left:0
        }

        100% {
            left:-200%
        }
    }

    @-moz-keyframes cloud_three {
        0% {
            left:0
        }

        100% {
            left:-200%
        }
    }

HTML

<div class="sky">
  <div class="clouds_one"></div>
  <div class="clouds_two"></div>
  <div class="clouds_three"></div>
</div>

Answer 1

 @-webkit-keyframes cloud_one {
    0% {
        left:100%
    }

    100% {
        left:-100%
    }
}

@-webkit-keyframes cloud_two {
    0% {
        left:100&
    }

    100% {
        left:-100%
    }
}

@-webkit-keyframes cloud_three {
    0% {
        left:+100%
    }

    100% {
        left:-100%
    }
}