main.css

 * {
	padding: 0;
	margin: 0;
	font-family: sans-serif;
}

.container{
	margin: 0 auto;
	margin: 10%;
}
h1{
	margin: auto auto;
	text-align: center;
	margin-bottom: 10px;
}
input[type=text], select {
  width: 100%;
  padding: 12px 20px;
  margin: 8px 0;
  display: inline-block;
  border: 1px solid #ccc;
  border-radius: 4px;
  box-sizing: border-box;
}
input[type=password], select {
  width: 100%;
  padding: 12px 20px;
  margin: 8px 0;
  display: inline-block;
  border: 1px solid #ccc;
  border-radius: 4px;
  box-sizing: border-box;
}
input[type=submit] {
  width: 100%;
  background-color: #2ecc71;
  color: white;
  padding: 14px 20px;
  margin: 8px 0;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

input[type=submit]:hover {
  background-color: #27ae60;
}
label {
	color: #333;
}

.mode {
  position: absolute;
  bottom: 10px;
  right: 10px;
  opacity: 0.5;
}
.mode input {
  width: 100%;
  background-color: white;
  color: black;
  
  margin: 8px 2px;

  cursor: pointer;
}
.mode input:hover {
  background-color: white;
}
.openfile {
  position: absolute;
  bottom: 10px;
  left: 10px;
  opacity: 0.5;
}
.openfile input {
  width: 100%;
  background-color: white;
  color: black;
  
  margin: 8px 2px;

  cursor: pointer;
}
.openfile input:hover {
  background-color: white;
  
}