html { 
  background: url('nblg/valkyria-fumia-2.jpg') no-repeat 47% top fixed; 
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
  height: 100%;
  min-height: 100%;
}
body, #click-placeholder {
    height: 100%;
    width: 100%;
    margin: 0;
}

#click-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    min-height: 100%;
    min-width: 100%;
    z-index: 1;
}

#credit {
    position: absolute;
    bottom: 0;
    left: 0;
    z-index: 2;
    height: 32px;
    line-height: 32px;
    padding: 0.25em 0.5em 0 0.25em;
    font-family: "Noto Sans CJK JP", Osaka, "メイリオ", Meiryo, "ＭＳ Ｐゴシック", "MS PGothic", sans-serif;
    text-decoration: none;
    color: #000000;
    background-color: #ffffff;
    background-color: rgba(255, 255, 255, 0.85);
    border-top-right-radius: 10px;
    border: 1px solid black;
    border-left: none;
    border-bottom: none;
    border-color: rgba(0, 0, 0, 0.6);
    box-shadow: 0 0 1em white;
    box-shadow: 0 0 1em rgba(255, 255, 255, 0.85);
}
#credit:before {
    display: inline-block;
    font-family: 'icomoon';
    font-size: 1.33333333em;
    padding: 0 3px;
    line-height: .75em;
    width: 24px;
    vertical-align: -15%;
}
#credit[data-icon="twitter"]:before {
    content: "\ea96";
    color: #1da1f2;
}
#credit[data-icon="pixiv"]:before {
    content: "\e900";
    color: #0096db;
    vertical-align: -10%;
    font-size: 1.5em;
}

#credit:hover, #credit:hover:before {
    color: #ffffff;
}
#credit:hover {
    background-color: #00000;
    background-color: rgba(0, 0, 0, 0.85);
    border-color: #ffffff;
    border-color: rgba(255, 255, 255, 0.9);
    box-shadow: 0 0 1em black;
    box-shadow: 0 0 1em rgba(0, 0, 0, 0.85);
}