* {
  box-sizing: border-box;
}

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

drl { /* used in teacher.php, not student.php */
/*  display: block;

  text-decoration: underline;
  text-underline-offset: 0.3em;
  */
  font-size: 1.2rem; 
  padding: 5px;
  padding-left: 10px;
  font-family: times;
  font-size: 20px;
  font-style: italic;
  font-weight: bold;
  /*background-color: green; */
  color: black;
}

eq {
/*  display: block;

  text-decoration: underline;
  text-underline-offset: 0.3em;
  */
  font-size: 1.2rem; 
  padding: 5px;
  padding-left: 0px;
  font-family: times;
  font-style: italic;
  /*background-color: green;*/
  color: blue; /*hsl(207, 90%, 54%);  */
}

.header {
  background-color: lightblue;
  padding: 2px;
  text-align: center;
  font-size: 16px;
}

.column { /* Create three unequal columns that floats next to each other */
  float: left;
  padding: 0px;
  height: 500px; /* this should be slightly bigger than height of the canvas to remove the vertical scrollbar  */
}

.column.side { /* Left and right column */
  width: 35%;
}

.column.middle { /* Middle column */
  width: 65%;
}

.row:after { /* Clear floats after the columns */
  content: "";
  display: table;
  clear: both;
}

.footer { /* Style the footer */
  background-color: #f1f1f1;
  padding: 2px;
  text-align: center;
}

/* Responsive layout - makes the three columns stack on top of each other instead of next to each other */
@media (max-width: 600px) {
  .column.side, .column.middle {
    width: 100%;
  }

table, th, td {
  border: 1px solid black;
  }
}

.button {
  background-color: #4CAF50; /* Green */
  border: none;
  color: white;
  padding: 5px 15px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 20px;
}

.btn_menuS:hover {background-color: green}
input {
  width: 20%;
   font-size: 26px;
}
/************ begin of style for myForm *******************/
/* The popup form - hidden by default */
.form-popup {
  display: none;
  position:absolute;
  left:30%;
  top:20%;
  right:30%;
  margin-left:-202px;
  border: 5px solid #f1f1f1;
  padding: 10px;
  background-color: lightgray;
  z-index: 9;
}

/* Add styles to the form container */
.form-container {
  max-width: 300px;
  padding: 10px;
  background-color: white;
}

/* Full-width input fields */
.form-container input[type=text], .form-container input[type=password] {
  width: 100%;
  padding: 15px;
  margin: 5px 0 22px 0;
  border: none;
  background: #f1f1f1;
}

/* When the inputs get focus, do something */
.form-container input[type=text]:focus, .form-container input[type=password]:focus {
  background-color: #ddd;
  outline: none;
}

/* Set a style for the submit/login button */
.form-container .btn {
  background-color: #4CAF50;
  color: white;
  padding: 16px 20px;
  border: none;
  cursor: pointer;
  width: 100%;
  margin-bottom:10px;
  opacity: 0.8;
}

/* Add a red background color to the cancel button */
.form-container .cancel {
  background-color: red;
}

/* Add some hover effects to buttons */
.form-container .btn:hover, .open-button:hover {
  opacity: 1;
}  /*************** end of style for myForm */