style.css

/*Base Styles*/
* {
 box-sizing: border-box;
 margin: 0;
 padding: 0;
 font-family: Arial, sans-serif;
}

body {
 min-heigth: 100vh;
 min-width: 100vw;
 background-color: #f8f8f8;
 display: flex;
 justify-content: center;
 align-items: center;
}

.container {
 margin: 20px;
}

.text-center {
 text-align: center;
}

.text-green-600 {
 color: #2f3238;
}

.text-lg {
 font-size: 1.38rem;
}

.text-2xl {
 font-size: 1.75rem;
}

.font-sans {
 font-family: Arial, sans-serif;
}

.font-light {
 font-weight: 200;
}

.font-bolder {
 font-weight: 800;
}

.border {
 border-width: 2px;
 border-color: #a0aec0;
 border-style: solid;
}

.rounded-xl {
 border-radius: 1rem;
}

.shadow-xl {
 box-shadow: 0 10px 20px rgba(0, 0, 0, 0.19), 0 6px 6px rgba(0, 0, 0, 0.23);
}

.mt-4 {
 margin-top: 1rem;
}

.m-4 {
 margin: 1rem;
}

.p-4 {
 padding: 1rem;
}

.flex {
 display: flex;
 justify-content: center;
 align-items: center;
}

/*Mario Character*/
#mario {
 position: fixed;
 top: 50%;
 left: 50%;
 width: 240px;
 height: 240px;
 z-index: 9999;
 transform: translate(-50%, -50%);
}

#mario-right {
 position: fixed;
 top: 50%;
 left: 50%;
 width: 240px;
 height: 240px;
 z-index: 9999;
 transform: translate(-50%, -50%);
}

#mario-left img {
 animation: moveLeft 3s linear infinite;
}

#mario-right img {
 animation: moveRight 3s linear infinite;
}

@keyframes moveLeft {
  0% {
    left: -100px;
 }
  100% {
    left: 100px;
 }
}

@keyframes moveRight {
  0% {
    right: -100px;
 }
  100% {
    right: 100px;
 }
}