body {
    background: #2c2c2f;
    color: #fff;
    font-family: 'Open Sans', sans-serif;
    max-height: 700px;
    overflow: hidden;
}




.c {
    text-align: center;
    display: block;
    position: relative;
    width: 80%;
    margin: 100px auto;
}

._404 {
    font-size: 220px;
    position: relative;
    display: inline-block;
    z-index: 2;
    height: 250px;
    letter-spacing: 15px;
    margin-top:0px;
}

._1 {
    text-align: center;
    display: block;
    position: relative;
    letter-spacing: 12px;
    font-size: 4em;
    
}

._2 {
    text-align: center;
    display: block;
    position: relative;
    font-size: 20px;
}

.text {
    font-size: 70px;
    text-align: center;
    position: relative;
    display: inline-block;
    margin: 19px 0px 0px 0px;
    /* top: 256.301px; */
    z-index: 3;
    width: 100%;
    line-height: 1.2em;
    display: inline-block;
}


.btn {
    background-color: rgb( 255, 255, 255 );
    position: relative;
    display: inline-block;
    width: 358px;
    padding: 5px;
    z-index: 5;
    font-size: 25px;
    margin: 0 auto;
    color: #2c2c2f;
    text-decoration: none;
    margin-right: 10px
}

.right {
    float: right;
    width: 60%;
}

hr {
    padding: 0;
    border: none;
    border-top: 5px solid #fff;
    color: #fff;
    text-align: center;
    margin: 0px auto;
    width: 420px;
    height: 10px;
    z-index: -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: -50px;
    left: 100px;
    -webkit-transform: scale(0.3);
    -moz-transform: scale(0.3);
    transform: scale(0.3);
    opacity: 0.9;
    -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);
    -webkit-animation: moveclouds 17s linear infinite;
    -moz-animation: moveclouds 17s linear infinite;
    -o-animation: moveclouds 17s linear infinite;
}

.x2 {
    left: 250px;
    top: 30px;
    -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;
    bottom: -70px;
    -webkit-transform: scale(0.6);
    -moz-transform: scale(0.6);
    transform: scale(0.6);
    opacity: 0.8;
    -webkit-animation: moveclouds 25s linear infinite;
    -moz-animation: moveclouds 25s linear infinite;
    -o-animation: moveclouds 25s linear infinite;
}

.x4 {
    left: 470px;
    botttom: 20px;
    -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: 300px;
    -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;
    }
}



/**
 * responsive - main-404-content
 * ------------------------------------------------------------------- 
 */


@media only screen {
    .c {
        margin-top: calc((50vh/2.2));
    }


    ._404 {
        font-size: calc(10vw + 10vh);
        height: calc(30vh);
    }

    hr {
        width: calc(30vw);
    }

    ._1 {
        font-size: calc(2vw + 2vh);
    }

    ._2 {
        font-size: calc(1.5vw + 1.5vh);
    }

    .btn {
        width: calc(30vw - 30px);
        font-size: calc(1.5vw + 1.5vh);
    }
}

@media only screen and (max-width:500px) {
    .btn {
        width: 110px;
        font-size: 11px;
    }
    hr {
        width: 160px;
    }


    ._404 {
        font-size: 80px;
        height: 100px;
    }


    ._1 {
        font-size: 14px;
    }

    ._2 {
        font-size: 14px;
    }



}