body {
  margin: 0;
  padding: 0;
  font-family: "Nunito", sans-serif;
}

/* Header */
header {
  background-color: #333;
  color: #fff;
  height: 80px;
  display: flex;
  align-items: center;
  padding: 0 20px;
}

header h1 {
  margin: 0;
  font-size: 30px;
}

/* Navigation bar */
nav {
  background-color: #333;
  color: #fff;
  height: 100%;
  position: fixed;
  left: 0;
  top: 80px;
  width: 200px;
  display: flex;
  flex-direction: column;
}

nav h2 {
  margin: 20px 0;
  text-align: center;
}

nav ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  margin: 0;
  padding: 0;
}

nav ul li {
  margin: 5px 0;
  position: relative;
}

nav ul li a {
  color: #fff;
  text-decoration: none;
  padding: 10px;
  display: block;
}

nav ul li:hover > ul {
  display: block;
}

nav ul ul {
  display: none;
  position: absolute;
  top: 0;
  left: 200px;
  background-color: #333;
  padding: 0;
}

nav ul ul li {
  width: 200px;
  float: none;
  display: list-item;
  position: relative;
}

nav ul ul ul {
  display: none;
  position: absolute;
  top: 0;
  left: 200px;
  background-color: #333;
  padding: 0;
}

nav ul ul ul li {
  width: 200px;
  float: none;
  display: list-item;
  position: relative;
}

nav ul ul ul ul {
  display: none;
  position: absolute;
  top: 0;
  left: 200px;
  background-color: #333;
  padding: 0;
}


/* The Modal (background) */
.modal {
  display: none; /* Hidden by default */
  position: fixed; /* Stay in place */
  z-index: 1; /* Sit on top */
  padding-top: 100px; /* Location of the box */
  left: 0;
  top: 0;
  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 */
}

/* Modal Content */
.modal-content {
  position: relative;
  background-color: #fefefe;
  margin: auto;
  padding: 0;
  border: 1px solid #888;
  width: 80%;
  box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2),0 6px 20px 0 rgba(0,0,0,0.19);
  -webkit-animation-name: animatetop;
  -webkit-animation-duration: 0.4s;
  animation-name: animatetop;
  animation-duration: 0.4s
}

/* Add Animation */
@-webkit-keyframes animatetop {
  from {top:-300px; opacity:0} 
  to {top:0; opacity:1}
}

@keyframes animatetop {
  from {top:-300px; opacity:0}
  to {top:0; opacity:1}
}

/* The Close Button */
.close {
  color: white;
  float: right;
  font-size: 28px;
  font-weight: bold;
}

.close:hover,
.close:focus {
  color: #000;
  text-decoration: none;
  cursor: pointer;
}

.btn-primary {
    color: #fff;
    background-color: #007bff;
    border-color: #007bff;
}

.btn-danger {
    color: #fff;
    background-color: #dc3545;
    border-color: #dc3545;
}

.btn-success {
    color: #fff;
    background-color: #28a745;
    border-color: #28a745;
}

.btn-secondary {
    color: #fff;
    background-color: #6c757d;
    border-color: #6c757d;
}

.btn {
    display: inline-block;
    margin-bottom: 0;
    font-weight: 400;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    -ms-touch-action: manipulation;
    touch-action: manipulation;
    cursor: pointer;
    background-image: none;
    border: 0;
    padding: 6px 12px;
    font-size: 14px;
    line-height: 1.42857143;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}


.form-control {
    display: block;
    width: 100%;
    padding: .375rem .75rem;
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.5;
    color: #212529;
    background-color: #fff;
    background-clip: padding-box;
    border: 1px solid #ced4da;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    border-radius: .25rem;
    transition: border-color .15sease-in-out, box-shadow .15sease-in-out;
}
.modal-header {
  padding: 2px 16px;
  background-color: #5cb85c;
  color: white;
}

.modal-body {padding: 25px;}

.modal-footer {
  padding: 2px 16px;
  background-color: #5cb85c;
  color: white;
}
nav ul ul ul ul li {
  width: 200px;
  float: none;
  display: list-item;
  position: relative;
}

/* Main content */
main {
  margin-left: 200px;
  padding: 20px;
}

/* Footer */
footer {
  background-color: #333;
  color: #fff;
  text-align: center;
  padding: 20px;
  position: absolute;
  bottom: 0;
  width: 100%;
}

.right {
  margin-left: 650px;
  color: white;
}

.form-group {
  margin-bottom: 20px;
}
.form-group label {
  display: block;
  margin-bottom: 5px;
}
.form-group input, .form-group select {
  display: block;
  width: 100%;
  height: 40px;
  padding: 10px;
  font-size: 16px;
  border-radius: 4px;
  border: 1px solid #ccc;
  background-color: #fff;
  box-shadow: inset 0 1px 1px rgba(0,0,0,0.075);
  transition: border-color ease-in-out 0.15s, box-shadow ease-in-out 0.15s;
}
.form-group input:focus, .form-group select:focus {
  border-color: #4d90fe
}
  table {
  border-collapse: collapse;
  width: 100%;
}

table th,
table td {
  padding: 8px;
  text-align: left;
  border: 1px solid #ddd;
}

table th {
  background-color: #f2f2f2;
  color: #333;
  font-weight: bold;
}

table tr:nth-child(even) {
  background-color: #f2f2f2;
}

table tr:hover {
  background-color: #ddd;
}