.column {
    float: left;
    width: 30%;
  } 
  
.row::after {
    content: "";
    display: table;
    clear: both;
  }

.normal_table td tr{
  border: 1px solid #333;
}



/*for loader*/

/*Hidden class for adding and removing*/
.lds-dual-ring.hidden {
  display: none;
}

/*Add an overlay to the entire page blocking any further presses to buttons or other elements.*/
.overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 150vh;
  background: rgba(0,0,0,.8);
  z-index: 999;
  opacity: 1;
  transition: all 0.5s;
  margin-left: 50%;
  margin-top: 500px;
}

/*Spinner Styles*/
.lds-dual-ring {
  display: inline-block;
  width: 80px;
  height: 100px;

}
.lds-dual-ring:after {
  content: " ";
  display: block;
  width: 64px;
  height: 64px;
  margin: 5% auto;
  border-radius: 50%;
  border: 6px solid #fff;
  border-color: #fff transparent #fff transparent;
  animation: lds-dual-ring 1.2s linear infinite;
}
@keyframes lds-dual-ring {
  0% {
      transform: rotate(0deg);
  }
  100% {
      transform: rotate(360deg);
  }
}

.row_selected{
  background-color: yellow;
}
#minutes{
  color: white;
}
#seconds{
  color: white;
}
#counter{
  color:white;
}

/* for the title */
#main_title{
  margin-right: 20%;

}
#links{
  margin-left: 40%;
  
}
#links a#home {
  text-decoration: none;
  color: white;
}
#links a#tutorial {
  text-decoration: none;
  color: white;
}
#links a#contact {
  text-decoration: none;
  color: white;
}

#main_title, #links{
  display: inline;
}