body, html {
	height: 100%;
}

body {
  font-family: Arial, Helvetica, sans-serif;
}


/* Responsive layout - when the screen is less than 600px wide, make the three columns stack on top of each other instead of next to each other */
@media screen and (max-width: 767px) {
  .column {
    width: 100%;
  }
}

input[type=text] {
  background-color: black;
  color: white;
  text-align: center;
  font-size: 30px;
  width: 35px;
  padding: 12px 20px;
  margin: 8px 0;
  border-radius: 6px;
  border: 1px solid black;
}
button#link {
  background-color: #663300; /* Green */ 
  color: white;
  cursor: pointer;
  border: 2px solid #994d00;
  border-radius: 4px;
}
button#link:hover {
  background-color: lightblue; /* Green */
  color: black;
}
button#active {
  background-color: #ff9900; /* Green */ 
  color: white;
  cursor: pointer;
  border: 2px solid #ffcc80;
  border-radius: 4px;
}
button#active:hover {
  background-color: lightblue; /* Green */
  color: black;
}
button#btn {
  background-color: blue; /* Green */
  padding: 6px 10px;  
  color: white;
  border: 2px solid lightblue;
  border-radius: 4px;
  cursor: pointer;
}

button#btn:hover {
  background-color: lightblue; /* Green */
  color: blue;
}

/* The Modal (background) */
.modal {
   /* Hidden by default */
  margin: 0;
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100%; /* Full width */
  height: 100%; /* Full height */
  overflow: auto; /* Enable scroll if needed */
  background-color: rgb(0,0,0); /* Fallback color */
  background-color: rgba(0,0,0,0.4); /* Black w/ opacity */
}
@media only screen and (max-width:800px) {
  /* For tablets: */
  .modal-content {
    width: 50%;
    padding: 0;
  }
}
@media only screen and (max-width:500px) {
  /* For mobile phones: */
  .modal-content {
    width: 94%;
  }
  td {
    border: 1px solid blue;
  }
}

/* Modal Content */
.modal-content {
 position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: white;
  background-color: #4CAF50;
  margin: auto;
  padding: 5px;
  display: block;
  border: 3px solid green;
  border-radius: 4px;
  overflow: auto;  
}
.zadacha {
   background-color: black;
   border: 3px solid black;
   border-radius: 4px;
   text-align: center;
   overflow: auto;
}
/* The Close Button */
.close {
  color: black;
  background-color: yellow;
  padding: 2px 10px;
  float: right;
  font-weight: bold;
  border-radius: 50%;
  border: 2px solid orange;
  text-align: center;
}

.close:hover,
.close:focus {
  color: #000;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid #888;
}

#myProgress {
  width: 100%;
  background-color: grey;
  text-align: center;
  border-radius: 6px;
  overflow: auto;
}

#myBar {
  width: 100%;
  height: 20px;
  background-color: orange;
  text-align: center;
  line-height: 20px;
  color: black;
}
table#tab {
  border: 2px solid blue;

}
th {
  background-color: blue;
}
td {
  border: 1px solid blue;
  padding: 2px 10px;
}