body {
   color: aliceblue; 
   text-shadow: 2px 2px black;
   background-color: rgb(56, 35, 248);
}

.divbox1 {
   border: 1px solid white;
   background-color: rgb(49, 49, 221);
   width: 240px;
   height: 30px;
   text-align: center;
   animation: colorchange;
   animation-duration: 1s;
   animation-iteration-count: infinite;
}
@keyframes colorchange {
   from { background-color: skyblue; }
   to { background-color: blue;}
}

/* --------------- */