body {
        margin: 0;
        padding: 0;
        background-color: lightskyblue;
    }
    
    h1 {}
    
    h2 {}
    
    h3 {}
    
    h4 {}
    
    p {}
    
    span {}
    
    footer {
        background: #D0E4F5 url("https://images.pexels.com/photos/2127789/pexels-photo-2127789.jpeg?cs=srgb&dl=adventure-air-aircraft-2127789.jpg&fm=jpg") no-repeat scroll 0% 50%;
        text-align: center;
    }
    
    .title {
        background: #D0E4F5 url("https://images.pexels.com/photos/796306/pexels-photo-796306.jpeg?cs=srgb&dl=clouds-cold-daylight-796306.jpg&fm=jpg") no-repeat fixed 0px 0px;
        text-align: center;
    }
    
    .content {
        background: #D0E4F5 url("https://images.pexels.com/photos/2166695/pexels-photo-2166695.jpeg?cs=srgb&dl=backlit-fog-foggy-2166695.jpg&fm=jpg") no-repeat scroll 0% 0%;
        text-align: center;
    }
    
    .block {
        position: relative;
        background: linear-gradient(0deg, lightblue, lightskyblue);
    }
    
    .block:before,
    .block:after {
        content: '';
        position: absolute;
        left: -2px;
        top: -2px;
        background: linear-gradient(45deg, #fb0094, #0000ff, #00ff00, #ffff00, #ff0000, #fb0094, #0000ff, #00ff00, #ffff00, #ff0000);
        background-size: 400%;
        width: calc(100% + 4px);
        height: calc(100% + 4px);
        z-index: -1;
        animation: steam 20s linear infinite;
    }
    
    @keyframes steam {
        0% {
            background-position: 0 0;
        }
        50% {
            background-position: 400% 0;
        }
        100% {
            background-position: 0 0;
        }
    }
    
    .block:after {
        filter: blur(50px);
    }