body {
  background-image: url("https://dannarchy.com/misc/backgrnd/plasma.gif");
  color: black;
  font-family: Verdana;
}

#main {
  width: 50%;
  margin: auto;
  background-color: transparent;
  }

div {
  background-color: #136e6c;
  border-radius: 4px;
  border: 12px solid #ff1e00; 
  padding: 3px 7px;
  margin: 10px;
  }
  
  @keyframes color-animation {
        0% {
            background-color: red; /* Start color */
        }
        50% {
            background-color: #210e02; /* Middle color */
        }
        100% {
            background-color: red; /* End colr */
        }
    }