This code adds a subtle glow to the text. It looks very good with the accent colors.

Chanhe colors in code

background: radial-gradient(circle, #48cae4, #7209b7);

Change Glow Time In Code

animation: glow 2.5s ease-in-out infinite;

Change Shadow Settings in 

 0%, 100% { text-shadow: 0 0 5px rgba(72, 202, 228, 0.5); }    50% { text-shadow: 0 0 15px rgba(72, 202, 228, 1); }

Full Code

.css-tutorial {
   background: radial-gradient(circle, #48cae4, #7209b7);
   -webkit-background-clip: text;
   -webkit-text-fill-color: transparent;
   background-clip: text;
   animation: glow 2.5s ease-in-out infinite;
}
@keyframes glow {
   0%, 100% { text-shadow: 0 0 5px rgba(72, 202, 228, 0.5); }
   50% { text-shadow: 0 0 15px rgba(72, 202, 228, 1); }
}