html {
    color: #111;
    font-size: 1em;
    line-height: 1.4;
}
body {
    background: #f3febd;
    font-family: 'Courier New', Courier, monospace;
}

#hodor {
    display: grid;
    max-width: 600px;
    grid-column-gap: 30px;
    grid-template-columns: 300px 1fr;
    margin: 30px auto 0 auto;
}
    #hodor-description {
        background: #b2dbbf;
        padding: 15px 25px 15px 35px;
    }
        #hodor-description h1 {
            margin: 0;
            padding: 0;
            line-height: 1em;
            text-shadow: 1px 1px 1px #f3febd;
        }
        #hodor-description h3 {
            margin: 0;
            padding: 20px 0 0 0;
            text-shadow: 1px 1px 1px #f3febd;
        }
        #hodor-description p {}

    #hodor-sandbox {
        text-align: center;
        padding: 50px 0 0 0;
    }
    #door {
        width: 220px;
        height: 275px;
        perspective: 700px;
        display: inline-block;
        background: #ffffff;
        border: 4px solid #70c1b3;
        border-top: 6px solid #70c1b3;
        border-bottom: 20px solid #70c1b3;
    }
        #panel {
            width: 100%;
            height: 100%;
            z-index: 100;
            display: block;
            position: relative;
            background: #b2dbbf;
            transform-origin: left;
            transition: 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
        }
            #door:hover #panel {
                transform: rotateY(-84deg);
            }
            #panel span {
                font-weight: bold;
                line-height: 250px;
            }
        #behind {
            width: 100%;
            z-index: 10;
            height: 100%;
            position: absolute;
            background: #247ba0;
        }
            #behind a {
                color: #fc1654;
                line-height: 1em;
                font-weight: bold;
                padding: 5px 15px;
                position: relative;
                border-radius: 50px;
                background: #f3febd;
                display: inline-block;
                text-decoration: none;
                margin: 50% auto 0 auto;
                border: 2px solid #fc1654;
                transition: 0.3s cubic-bezier(0.23, 1, 0.320, 1);
            }
                #behind a:hover {
                    color: #f3febd;
                    border: 2px solid #f3febd;
                    background: #fc1654;
                }
                #behind a:active {
                    color: #247ba0;
                    border: 2px solid #f3febd;
                    background: #b2dbbf;
                }
                #behind a:before,
                #behind a:after {
                    overflow: hidden;
                    top: 0;
                    left: 50%;
                    z-index: -1;
                    content: 'Click me!';
                    position: absolute;
                    transition: 1s cubic-bezier(0.23, 1, 0.320, 1);
                    transform: translateX(-50%);
                }
                #behind a:after {
                    content: 'Click it!';
                }
                    #behind a:hover:before {
                        top: -30px;
                    }
                    #behind a:hover:after {
                        top: 40px;
                    }