Ejemplo de animación de carga CSS

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Plantilla de sitio web HTML y CSS

HTML

<!DOCTYPE html>
<html lang="pt-BR">
<head>
   <style>

* {
         margin: 0;
         padding: 0;
         box-sizing: border-box;
      }
      
      body {
         background:url("./thumb.jpg") no-repeat center center;
         background-color: black; /* changed background color to black */
         background-size: cover;
         display: flex;
         align-items: center;
         justify-content: center;
         height: 100vh;
         overflow: hidden;
      }
      
      .codigo {
         position: absolute;
         top: 0;
         left: 50%;
         transform: translateX(-50%);
         background: #272822;
         color: #F8F8F2;
         font-family: 'Consolas', 'Monaco', monospace;
         font-size: 18px;
         padding: 20px;
         border-radius: 8px;
         white-space: pre-line;
         text-align: left;
         line-height: 1.6;
         max-height: 25%;
         max-width: 75%;
         width: 75%;
         height: 25%;
         top:15%;
         overflow-y: hidden;
          box-shadow: -8px 10px 18px rgba(0, 0, 0, 0.55);
      }
      
      .selector       { color: #F92672; }
      .property       { color: #66D9EF; }
      .value-number   { color: #AE81FF; }
      .value-string   { color: #E6DB74; }
      .value-color    { color: #A6E22E; }
      .function       { color: #A6E22E; }
      
      .animation-container {
         position: absolute;
         top: 75%;
         left: 50%;
         transform: translate(-50%, -50%);
         display: flex;
         align-items: center;
         justify-content: center;
         width: 100%;
         height: 50%;
         overflow: hidden;
         background: transparent;
      }
      
      /* 
      * 
      * Main Animation
      * 
      */
      .loading-element {
         position: relative;
         width: 50vh;
         height: 50vh;
         border-radius: 50%;
         background-color: #222;
         border: 1px solid #FFF;
         animation: loading-animation 1s linear infinite;
      }
      
      .loading-element::before, .loading-element::after {
         content: "";
         position: absolute;
         width: 1vh;
         height: 10vh;
         border-radius: 10vh;
         background-color: #FFF;
         animation: loading-animation 1s linear infinite;
      }
      
      .loading-element::before {
         left: 0;
         top: 45vh;
      }
      
      .loading-element::after {
         right: 0;
         top: 45vh;
      }
      
      .loading-element2 {
         position: relative;
         width: 0;
         height: 0;
         border-style: solid;
         border-width: 0 0 5vh 0;
         border-color: transparent transparent #FFF transparent;
         animation: growing-animation 1s linear;
      }
      
      .loading-element2::before {
         content: "";
         position: absolute;
         width: 0;
         height: 0;
         border-style: solid;
         border-width: 0 0 10vh 0;
         border-color: transparent transparent #000 transparent;
         animation: growing-animation 1s linear;
      }
      
      @keyframes loading-animation {
         0% {
            transform: rotate(0deg);
            opacity: 1;
            border-color: #FFF;
         }
         100% {
            transform: rotate(360deg);
            opacity: 0;
            border-color: #000;
         }
      }
      
      @keyframes growing-animation {
         0% {
            border-width: 0 0 5vh 0;
         }
         100% {
            border-width: 0 0 15vh 0;
         }
      }
      
      /* 
      * Micro-details for replay value
      */
      .micro-detail {
         position: absolute;
         width: 10vh;
         height: 10vh;
         background-color: #333;
         animation: micro-animation 1s linear;
      }
      
      .micro-detail::before {
         content: "";
         position: absolute;
         width: 5vh;
         height: 5vh;
         background-color: #FFF;
         animation: micro-animation 1s linear;
      }
      
      @keyframes micro-animation {
         0% {
            opacity: 1;
         }
         50% {
            opacity: 0;
         }
         100% {
            opacity: 1;
         }
      }
   </style>
</head>
<body>
   <div class="animation-container">
      <div class="loading-element"></div>
   </div>

</body>
</html>

CSS

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;

body{
    background: rgb(251, 247, 247);
      overflow-x: hidden; }

}

.band{
    color: white;
    background-color: blueviolet;
    height: 30px ;

}

.band h1{
    padding: 10px;
    font: 1em sans-serif;
    text-align: center;
}

.logo{
    font-family: sans-serif;
    font-size: large;
    text-align: center;
    padding: 30px;

}

nav{
    height: 80px;
    background-color: rgb(251, 251, 251)
}
.hero{
    height: 400px;
    background-color: white;
    display: flex;
}

.hero .container{
display: flex;
height: 98%;
width: 100%;

}

.container img{
    width: 100%;
}

.content{
    align-items: center;
    display: flex;
    flex-direction: column;
    color: white;
    font-family: sans-serif;
    font-size: 40px;
    margin-top: -200px;
}

.content button{
height: 40px;
width: 150px;
font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
background-color: white;
color: black;
border:none;
border-radius: 3px;
}

.title{
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top:130px;
}

.title h1{
    font-family: sans-serif;
    font-size: 25px;
    margin-bottom: 50px;
}

.product{
    background-color: rgb(255, 255, 255);
    border-radius: 10px;
    height: 320px;
    width: 200px;
    flex-direction: column;
    display: flex;
}
.product img{
    height: 200px;
}
.product button{
    height: 50px;
    width: 200px;
    background-color: rgb(51, 47, 47);
    color: #ffffff;
    border: none;

}
.product h2{
margin-top: 20px;
color: rgb(0, 0, 0);
font-family: sans-serif;
font-size: 15px;
margin-bottom: 20px;
text-align: center;

}
.product p{
    font-family: sans-serif;
    font-size: 15px;
    position: relative;
    color: rgb(0, 0, 0);
    left: 160px;
    
}

.product-container {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
}

.product {
    margin: 10px;
}