.fixed {
        position: fixed;
        width: 100%;
        height: 100%;
        background: rgba(0,0,0,0.5);;
        z-index: 15;
    }
    .center {
        margin-top: 20px;
        width: 300px;
        margin-left: auto ;
        margin-right: auto;
        background:#1F1F1F ;
        border-color:#cfcfcf;
        border-style: dotted; 
        border-radius: 25px;
        text-align: center;
    }
    input[type=button],input[type=submit] {
          background-color: green;
          border: none; /* 2px solid green;   */
          color: white;
          padding: 5px;
          text-align: center;
          text-decoration: none;
          display: inline-block;
          font-size: 18px;
          margin: 4px 2px;
          cursor: pointer;
          border-radius: 5px; 
    }
    textarea{
        background-color: #1F1F1F;
        border: 2px solid green;
        color: white;
        padding: 5px;
        text-align: left;
        font-size: 18px;
        margin: 4px 2px;
        cursor: pointer;
        border-radius: 5px; 
    }
    h1,h2,h3{
        color: #cfcfcf;
        font-weight: bold;
    }
    hr {
        height: 2px;
        border-color: #333333;
        color: #333333;
    }
    label {
        color: #cfcfcf;
        padding: 6px;
        font-size:16px;
        margin: 1px;
    }
    table {
        border: 1px solid;
        border-collapse:collapse;
        border-spacing:0;
        border-radius: 6px 6px 6px 6px;
            -moz-border-radius: 6px 6px 6px 6px;
            -webkit-border-radius: 6px 6px 6px 6px;
    }
    input {
        border-color: green;
        background-color: #1F1F1F;
        color: white;
        border-radius: 5px;
        padding: 3px;
        font-size:16px;
        margin: 1px;
    }
    select {
        border-color: gray;
        background-color: #1F1F1F;
        color: white;
        border-radius: 5px;  
        font-size:16px;
    }
    
    select option {
        font-size: 16px;
    }
    
    option {
        font-size: 16px;
        background: #1F1F1F;
        color: white;
    }
    body{
        font-size:16.5px;
        background-color: #1F1F1F; /* La página de fondo será negra */
        color: #808080; /*El texto de la página será blanco */
    }
    
    /* Remove the navbar's default margin-bottom and rounded borders */ 
    .navbar {
      margin-bottom: 0;
      border-radius: 0;
    }
    
    /* Set height of the grid so .sidenav can be 100% (adjust as needed) */
    .row.content {height: 100%}
    
    /* Set gray background color and 100% height */
    .sidenav {
      padding-top: 1px;
      background-color: #1F1F1F;
      height: 100%;
    }
    
    /* Set #1F1F1F background color, white text and some padding */
    footer {
      background-color: #1F1F1F;
      color: white;
      padding: 15px;
    }
    
    /* On small screens, set height to 'auto' for sidenav and grid */
    @media screen and (max-width: 767px) {
      .sidenav {
        height: auto;
        padding: 15px;
        color: gray;
        background-color: #1F1F1F;
      }
      .row.content {height:auto;} 
    }
    /*the container must be positioned relative:*/
    .custom-select {
      position: relative;
      font-family: Arial;
    }
    .oculto {
        display:none;
    }
    .centerImg {
      margin-left: auto;
      margin-right: auto;
    }