body {
      font-family: Arial, sans-serif;
      margin: 0;
      padding: 0;
      background-color: #f4f4f4;
      color: #333;
    }

    header {
      background-color: #20232a;
      color: #61dafb;
      padding: 20px;
      text-align: center;
    }

    main {
      display: flex;
      flex-wrap: wrap;
      padding: 20px;
    }

    article {
      flex: 2;
      margin-right: 20px;
      background: white;
      padding: 20px;
      border-radius: 10px;
      box-shadow: 0 0 10px rgba(0,0,0,0.1);
    }

    aside {
      flex: 1;
      background: #e9ecef;
      padding: 20px;
      border-radius: 10px;
      box-shadow: 0 0 10px rgba(0,0,0,0.1);
    }

    .slider {
width: 95%;
margin: auto;
overflow: hidden;
}

.slider ul {
display: flex;
padding: 0;
width: 400%;

animation: cambio 20s infinite alternate linear;
}

.slider li {
width: 100%;
list-style: none;
}

.slider img {
width: 100%;
}

@keyframes cambio {
0% {margin-left: 0;}
20% {margin-left: 0;}

25% {margin-left: -100%;}
45% {margin-left: -100%;}

50% {margin-left: -200%;}
70% {margin-left: -200%;}

75% {margin-left: -300%;}
100% {margin-left: -300%;}
}

    button {
      background-color: #007bff;
      color: white;
      padding: 10px 15px;
      border: none;
      border-radius: 5px;
      cursor: pointer;
      margin-top: 15px;
    }

    button:hover {
      background-color: #0056b3;
    }

    footer {
      text-align: center;
      padding: 15px;
      background-color: #20232a;
      color: #fff;
    }