@font-face {
    font-family: "Helvetica Backup";
    src: url("fonts/helvetica.woff");
}

@font-face {
    font-family: "Helvetica Backup";
    font-style: oblique;
    src: url("fonts/helvetica-oblique.woff");
}

@font-face {
    font-family: "Helvetica Backup";
    font-weight: bold;
    src: url("fonts/helvetica-bold.woff");
}

@font-face {
    font-family: "Helvetica Backup";
    font-weight: bold;
    font-style: oblique;
    src: url("fonts/helvetica-bold-olique.woff");
}

@-webkit-keyframes screen {
    from {background-position: 0% 0vmin;}
    to   {background-position: 0% 19vmin;}
}

@keyframes screen {
    from {background-position: 0% 0vmin;}
    to   {background-position: 0% 19vmin;}
}

/*@keyframes screen {
    0%   {background-position: 0% 0vmin;}
    45%  {background-position: 0% 10.5vmin;}
    55%  {background-position: 0% 8.5vmin;}
    100% {background-position: 0% 19vmin;}
}*/

body {
    margin: 0;
    box-sizing: border-box;
    font-family: Helvetica, "Helvetica Backup", sans-serif;
    font-size: 2vmin;
    background-color: gray;
/*    display: flex;
    flex-direction: column;*/
    /*background-image: url("images/earth.png");*/
}
    
    #header, #content, #footer {
        margin: 0 auto;
    }

    #content {
        background-color: #00ff00;
        border-radius: 5vmin;
        height: calc(100vh - 15vmin - 5vmin);
        width: calc(100vw - (2 * 5vmin));
    }
    
        #main {
            background-color: black;
            color: lightgray;
            height: 100%;
            width: 100%;
        }
    
    #header, #footer {
        overflow: auto;
        width: calc(100vw - (15vmin / 2));
    }
    
    #header {
        height: 15vmin;
    }
    
    #footer {
        display: -webkit-flex;
        display: flex;
        height: 5vmin;
        text-align: center;
    }
    
        #footer p {
            margin: auto;
        }
    
.energy-saver-btn {
    display: inline-block;
    cursor: pointer;
    color: white;
    background-color: #ce2a00;
    background-color: #ec2f00;
}

.energy-saver-on .energy-saver-btn {
    background-color: #3dce00;
}
    
.screen {
    isolation: isolate;
    overflow: hidden;
}

    .screen-bg {
        background-image: url("images/screen.png");
        background-size: 0.1vmin;
        mix-blend-mode: luminosity;
        -webkit-animation: screen linear 40s infinite;
        animation: screen linear 40s infinite;
        margin: 1px;
        height: 100%;
        width: 100%;
        overflow: hidden;
    }
    
    .energy-saver-on .screen-bg {
        -webkit-animation-play-state: paused;
        animation-play-state: paused;
    }

        .screen-content {
            mix-blend-mode: multiply;
            height: inherit;
            width: inherit;
            box-sizing: border-box;
            text-shadow: 0 0 0.5vmin;
        }

.screen-nav {
    display: -webkit-flex;
    display: flex;
    margin: 0 5vmin;
    font-size: 1.2em;
}

    .nav-tab {
        display: -webkit-inline-flex;
        display: inline-flex;
        -webkit-flex: 1;
        flex: 1;
        margin: 0.5vmin 1vmin;
        height: 5vmin;
        box-sizing: border-box;
        border: 0.5vmin solid white;
        border-top: none;
        padding: 0.5vmin;
        padding-top: 0;
        background-color: transparent;
        background-clip: content-box;
        color: white;
        text-decoration: none;
        /*box-shadow: 0 0 0.25vmin 0.25vmin white;*/
        filter: drop-shadow(0 0 0.125vmin white);
    }
    
    .nav-tab:first-child {
        /*margin-left: 0;*/
    }
    
    .nav-tab:last-child {
        /*margin-right: 0;*/
    }
    
    .nav-tab.current-tab,
    .nav-tab:hover {
        background-color: white;
        color: black;
        /*text-shadow: 0 0 1vmin;*/
    }
    
        .nav-tab span {
            margin: auto;
            padding: 0.25vmin;
        }

.screen-header {
    font-size: 3em;
    float: left;
    width: calc(100% - 40vmin);
}

.screen-header-img {
    float: right;
    max-width: 40vmin;
}

#main article {
    box-sizing: border-box;
    height: calc(100% - 5vmin - 0.5vmin - 0.5vmin);
    width: 100%;
    padding-top: 1.75vmin;
    padding-left: 5vmin;
    padding-right: 5vmin;
    margin-bottom: 5vmin;
    overflow: scroll;
}

#main article::-webkit-scrollbar {
    display: none;
}

#main article::scrollbar {
    display: none;
}