CSS如下：

#banner_wave_1 {
    width: auto;
    height: 65px;
    background: url(https://cdn.qnight.ink/blogfile/wave1.png) repeat-x;
    _filter: alpha(opacity=80);
    position: absolute;
    bottom: 0;
    width: 400%;
    left: -236px;
    z-index: 5;
    opacity: 1;
    transiton-property: opacity,bottom;
    transition-duration: .4s,.4s;
    animation-name: move2;
    animation-duration: 240s;
    animation-fill-mode: backwards;
    animation-timing-function: linear;
    animation-iteration-count: infinite;
}
#banner_wave_2 {
    width: auto;
    height: 80px;
    background: url(https://cdn.qnight.ink/blogfile/wave2.png) repeat-x;
    _filter: alpha(opacity=80);
    position: absolute;
    bottom: 0;
    width: 400%;
    left: 0;
    z-index: 4;
    opacity: 1;
    transiton-property: opacity,bottom;
    transition-duration: .4s,.4s;
    animation-name: move2;
    animation-duration: 160s;
    animation-fill-mode: backwards;
    animation-timing-function: linear;
    animation-iteration-count: infinite;
}
 
/* move1和move2只是方向不同，根据喜好自选即可。 */
/* 没做浏览器适配，具体哪些浏览器会生效未知，反正Chrome没什么问题。*/
 
@keyframes move1 {
  100%{
    background-position: 100% 0;
  }
}
 
@keyframes move2 {
  100%{
    background-position: -100% 0;
  }
}

两个DIV的穿插位置

/layouts下，打开imgbox.php。在下面所述位置插入

……
<style>.header-info::before{display: none !important;opacity: 0 !important;}</style>
<div id="banner_wave_1"></div><div id="banner_wave_2"></div>    <!--两个DIV插在这。-->
<figure id="centerbg" class="centerbg">
<?php if ( !akina_option('focus_infos') ){ ?>
    <div class="focusinfo">
        <?php if (akina_option('focus_logo')):?>
……
{1}