JSFiddle - React, Tailwind, and code Playground

HTML

<div class="box">
    <div class="spider"></div>
    <div id="wave"></div>
   </div>

CSS

@keyframes front {
	0% {z-index:4;  }
	50%{z-index:2;  }
	100%{z-index:0;  }
}
@keyframes back {
	0% {z-index:0;  }
	50%{z-index:2;  }
	100% {z-index:4; }
}
@-webkit-keyframes front {
	0% {z-index:4;  }
	50%{z-index:2;  }
	100%{z-index:0;  }
}
@-webkit-keyframes back {
	0% {z-index:0;  }
	50%{z-index:2;  }
	100% {z-index:4; }
}

body
{
    background:#590f00;
}
.box
{
    width:800px;
    height:434px;
    border-radius:13px;
    background:#741400;
    margin:55px auto;
    border:1px dashed #460c00;
    position:relative;
}
.spider
{
    width:30px;
    height:30px;
    position:absolute;
    top:140px;
    left:250px;
    background:#000;
    z-index:5;
		animation: back 2s;
		animation-iteration-count:infinite;
		-webkit-animation: back 2s;
		-webkit-animation-iteration-count:infinite;
		
}

#wave {
  position: relative;
  height: 2px;
  width: 600px;
	animation: front 2s;
	animation-iteration-count:infinite;
	-webkit-animation: front 2s;
	-webkit-animation-iteration-count:infinite;
	
}

#wave:before {
        content: "";
        display: block;
        position: absolute;
        border-radius: 100% 50%;
        width: 500px;
    height: 80px;
    right: -50px;
    top: 140px;
        border:3px solid #ffd800;
				
}

#wave:after {
        content: "";
        display: block;
        position: absolute;
        border-radius: 100% 50%;
        width: 300px;
    height: 70px;
    left: 0;
    top: 27px;
}