@import url(https://fonts.googleapis.com/css?family=Open+Sans:500);
body {
    background: #33cc99;
    color: #fff;
    font-family: 'Open Sans', sans-serif;
    height: 100vh;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}
.c {
    text-align: center;
    display: inline-block;
    width: auto;
    padding: 20px;
    background-color: rgba(255, 255, 255, 0.8);
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    color: #333;
}
._404 {
    font-size: 50px;
    margin-bottom: 20px;
    color: #E13300; /* Adding a bit of color */
}
._1, ._2 {
    color: #333; /* Dark text for readability */
}
._1 {
    font-size: 24px;
    margin-bottom: 15px;
}
._2 {
    font-size: 18px;
    margin-bottom: 20px;
}
.text {
    font-size: 22px;
    line-height: 1.4;
}
.btn {
    background-color: rgb(255, 255, 255);
    color: #33cc99;
    text-decoration: none;
    padding: 10px 15px;
    border-radius: 5px;
    display: inline-block;
    margin-top: 20px;
}
hr {
    margin-top: 20px;
    border-top: 3px solid #fff;
}

.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;}
}