body{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  --foo-color:#333333;
  --txt-color:#FFFFFF;
  --nav-color:#F3C311;
  --bag-color:#222222;
  --incople-color:#BD3936;
  font-family: monospace;
  background-color: var(--bag-color);
  color: var(--txt-color);
}

/* Header */

.header{
  color: var(--nav-color);
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 26px;
}

/* Comentario */
.coment{
  width: 100%;
  height: auto;
  border-bottom: 1px solid  var(--txt-color);
  text-align: center;
  font-size: 12px;
}
/* Reto Contenedor */
.reto{
 min-height: 450px ;
 display: flex;
 justify-content: center;
 align-items: center;
  padding:10px ;
}
/* Reto */


.slidecontainer {
    min-width: 400px;
  }
  
  .slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 25px;
    background: #d3d3d3;
    outline: none;
    opacity: 0.7;
    transition: opacity .2s;
  }
  
  .slider:hover {
    opacity: 1;
  }
  
  .slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 25px;
    height: 25px;
    background: var(--nav-color);
    cursor: pointer;
  }
  
  .slider::-moz-range-thumb {
    width: 25px;
    height: 25px;
    background:var(--nav-color);
    cursor: pointer;
  }
  

/* footer */

.foo{
  display: flex;
  align-items:center;
  justify-content: space-evenly;
  width: 100%;
  height: 200px;
  background-color: var(--foo-color);
}

span{
  font-size: 16px;
  color:  var(--nav-color);
  padding: 0 10px 0 10px;
}

/* Efectos y animaciones */

.header h1{
  animation: parpadeo 8s ease-in-out infinite;
}

@keyframes parpadeo {
  0%{
      color: var(--nav-color);
  }

  50%{
      color: var(--txt-color);
  }

  100%{
      color: var(--nav-color);  
  }
}