* {
    background-color: black;    
}

#shell {
    width: 900px;
    height: 480px;
    background-color:    black;

    overflow: hidden;

    position: fixed;
    top:0;
    left: 0;
    bottom: 0;
    right: 0;

    margin: auto;
}

.shell-command {
    position: relative;
    font-family: monospace;
    background-color: black;
    text-decoration: none;
    color: green;
    font-size: 1.5em;
    margin-top: 0%;
    margin-bottom: 0%;
}

.cursor {
    position: absolute;
    top: 0;
    bottom: 0;
    right: 1;
    width: 100%;
    background: black;
    box-sizing: border-box;
    -webkit-box-sizing: border-box;
    border-left: .5em solid;

    -webkit-animation:
        blinking 1s step-end infinite;
    animation:
        blinking 1s step-end infinite;
}

@-webkit-keyframes blinking {
    from, to { border-color: transparent; }
    50% { border-color: green; }
}

@keyframes blinking {
    from, to { border-color: transparent; }
    50% { border-color: green; }
}