html {
    background-color: #918282;
    min-height: 100%;
    font-family: "helvetica neue";
    background: url(imagenes/fondo.png), #886767;
    background: url(imagenes/fondo.png),
      -webkit-gradient(linear, right top, left top, from(#706464), to(#2233ec));
    background: url(imagenes/fondo.png),
      linear-gradient(to left, #298900, #689a67);
  }
  
  h1 {
    color: #fff;
    padding: 10px;
    font-family: sans-serif;
    font-size: 40px;
    text-shadow: 0px 0px 60px #333;
   
  }
  
  .contenedor {
    max-width: 400px;
    margin: 10px auto;
    background: white;
    border-radius: 5px;
    box-shadow: 5px 5px 15px -5px rgba(0, 0, 0, 0.3);
    align-items: center;
  }
  
  #cabecero {
     background: linear-gradient(to right,#103f00,#4ba867);
    text-align: center;
  }
  
  .elemento {
    
    min-height: 70px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid #f1f1f1;
  }
  
  .elemento:last-child {
    border-bottom: 0;
  }
  

  
  form {
    text-align: center;
    margin-left: 20px;
  }
  
  .boton {
    min-height: 50px;
    width: 50px;
    border-radius: 50%;
    border-color: transparent;
    background: linear-gradient(to bottom,#01c21e,#aab37f);
    color: #fff;
    font-size: 30px;
    padding-bottom: 6px;
    border-width: 0;
  }
  .boton:hover{
    background: linear-gradient(to top,#01c21e,#aab37f);
  
  }
  .calcular{
    
    min-height: 50px;
    width: 100px;
    border-radius: 20%;
    border-color: transparent;
    background: linear-gradient(to bottom,#05370c,#30ca37);
    color: #fff;
    font-size: 20px;
    margin-top: 6px;
    margin-left: 20px;
    margin-right: 30px;
    padding-bottom: 6px;
    border-width: 0;
  }
  .calcular:hover{
    background: linear-gradient(to top,#05370c,#30ca37);
  
  }
  .borrar{
    
    min-height: 50px;
    width: 100px;
    border-radius: 20%;
    border-color: transparent;
    background: linear-gradient(to bottom,#05370c,#30ca37);
    color: #fff;
    font-size: 20px;
    margin-top: 6px;
    margin-left: 20px;
    margin-right: 30px;
    padding-bottom: 6px;
    border-width: 0;
  }

  .borrar:hover{
    background: linear-gradient(to top,#05370c,#30ca37);
  
  }
  #resultado{
    text-align: center;
    padding: 10px;
    background: linear-gradient(to right,#01c21e,#aab37f);
    color: #fff;
  }
  

  input[type="number"] {
    text-align: center;
    height: 60px;
    top: 10px;
    border: none;
    background: transparent;
    font-weight: 200;
    width: 40%;
  }
  input[type="number"]:focus {
    outline: none;
    box-shadow: inset 0 -3px 0 0 #3f9f04;
  }
  
  ::placeholder {
    color: grey;
    opacity: 1;
  }
  

.cont{
  position: relative;
}
#hora{
  position: absolute;
  top: 10px;
  right: 20px;
  z-index: 1000;
  overflow: auto;
}
#fecha{
  position: absolute;
  top: 30px;
  right: 20px;
  z-index: 1000;
  overflow: auto;
}
#reloj{
  
  color: #fff;
}