src/core-greet/CoreGreetElement.css
:host {
display: inline;
contain: content;
font-family: Arial, Helvetica, sans-serif;
font-size: 20px;
color: black;
}
:host([rainbow]) {
animation: rainbow 6s infinite;
}
@keyframes rainbow {
0% { color: red }
15% { color: orange }
30% { color: yellow }
45% { color: green }
60% { color: blue }
75% { color: indigo }
90% { color: violet }
100%{ color: red }
}