html {
  width: 100%; 
}

body {
  margin: 0;
  width: 100%;
}

/* Remove margins and padding from the list */
ul {
  margin: 0;
  padding: 0;
}

/* Style the list items */
ul li {
  cursor: pointer;
  position: relative;
  padding: 12px 8px 12px 40px;
  background: #eee;
  transition: 0.2s;
  
  /* make the list items unselectable */
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

/* Set all odd list items to a different color (zebra-stripes) */
ul li:nth-child(odd) {
  background: #f9f9f9;
}

ul li:nth-child(even) {
}

/* Darker background-color on hover */
ul li:hover {
  background: #ddd;
}

/* When clicked on, add a background color and strike out text */
ul li.checked {
  background: #888;
  color: white;
  text-decoration: line-through;
}

/* Add a "checked" mark when clicked on */
ul li.checked::before {
  content: '';
  position: absolute;
  border-color: white;
  border-style: solid;
  border-width: 0 2px 2px 0;
  top: 10px;
  left: 16px;
  transform: rotate(45deg);
  height: 15px;
  width: 7px;
}

/* Style the close button */
.close {
  position: absolute;
  right: 0;
  top: 0;
  padding: 12px 16px 12px 16px
}

.close:hover {
  background-color: black;
  color: white;
}

/* Style the header */
.header {
  background-color: black;
  padding: 30px 40px;
  color: white;
  text-align: center;
}

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

/* Style the input */
input {
  border: 1px dashed black;
  width: 37%;
  padding: 10px;
}

/* Style the "Add" button */
.addBtn {
  /*padding: 10px 200px;*/
  background: #d9d9d9;
  color: #555;
  text-align: center;
  cursor: pointer;
  transition: 0.3s;
}

.addBtn:hover {
  background-color: #bbb;
}

#myBtn {
  display: none; /* Hidden by default */
  position: fixed; /* Fixed/sticky position */
  bottom: 0px; /* Place the button at the bottom of the page */
  right: 0px; /* Place the button 30px from the right */
  z-index: 99; /* Make sure it does not overlap */
  border: none; /* Remove borders */
  outline: none; /* Remove outline */
  background-color: red; /* Set a background color */
  color: white; /* Text color */
  cursor: pointer; /* Add a mouse pointer on hover */
  padding: 12px; /* Some padding */
  border-radius: 10px; /* Rounded corners */
  opacity: 0.75;
}

#myBtn:hover {
  background-color: #555; /* Add a dark-grey background on hover */
}