body {
    font-family: Arial, sans-serif;
    margin: 0;
    background-color: #f2f2f2;
  }
  header {
    display: flex;
    justify-content: space-between;
    background-color: #1C1F26;
    color: #00AEEF;
    /*padding: 10px;*/
    
  }
  header img {
    max-width: 150px;
    /*align-content: flex-end;*/
    margin: 0 0 auto;
  }
  nav {
    background-color: #2C3E50;
    padding: 10px;
    text-align: center;
    position: sticky;
    top: 0;
    z-index: 1000;
  }
  nav a {
    color: white;
    margin: 0 15px;
    text-decoration: none;
  }
  nav a:hover{
    background-color: #007ba7;
    padding: 10px;
    /*margin: 0 30px;*/
    transition: 500ms;
  }
  section {
    padding: 20px;
  }
  .noticia, .asignatura {
    display: flex;
    height: 100vh;
    justify-content: center;
    align-items: center;
    background-color: white;
    margin-bottom: 20px;
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  }
  footer {
    background-color: #1C1F26;
    color: white;
    text-align: center;
    padding: 15px;
    position: fixed;
    width: 100%;
    bottom: 0;
  }
  #scrollTopBtn {
    display: none;
    position: fixed;
    bottom: 80px;
    right: 20px;
    z-index: 1001;
    background-color: #00AEEF;
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 5px;
    cursor: pointer;
    box-shadow: 0 2px 5px rgba(0,0,0,0.3);
  }
  #scrollTopBtn:hover {
    background-color: #007ba7;
  }
  .login{
      padding: 30px;
      display: flex;
      justify-content: center;
      align-items: center;
    }
  .logincontainer {
    background-color: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    width: 300px;
   
  }

  .logincontainer h2 {
    text-align: center;
    margin-bottom: 20px;
  }

  .logincontainer input[type="text"],
  .logincontainer input[type="password"] {
    width: 100%;
    padding: 10px;
    margin: 8px 0;
    border: 1px solid #ccc;
    border-radius: 4px;
  }

  .logincontainer input[type="submit"] {
    width: 100%;
    background-color: #4CAF50;
    color: white;
    padding: 10px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
  }

  .logincontainer input[type="submit"]:hover {
    background-color: #45a049;
  }
  .calculadora {
    background-color: #fff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
  }
  
  #pantalla {
    width: 100%;
    height: 40px;
    font-size: 24px;
    margin-bottom: 10px;
    text-align: right;
    padding-right: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
  }
  
  .botones {
    display: grid;
    grid-template-columns: repeat(4, 60px);
    gap: 10px;
    justify-content: center;
  }
  
  button {
    height: 40px;
    font-size: 18px;
    border: none;
    border-radius: 5px;
    background-color: #e0e0e0;
    cursor: pointer;
    transition: background-color 0.2s;
  }
  
  button:hover {
    background-color: #d0d0d0;
  }
  
  .cero {
    grid-column: span 2;
  }