Accordeon läuft nicht richtig

Akkordeon hat ein Strich, den ich nicht wegbekommen.

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Dann hier klicken

Der hier verwendete Code

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    <!DOCTYPE html>
<html class="no-js" lang="en"><head>
<head>
<title>Accordeon</title>
</head>
<style>
body {
  color: #2c3e50;
  background: transparent;
}
h1 {
  text-align: center;
}
.half {
  float: left;
  width: 50%;
  padding: 0 1em;
}
/* Acordeon styles */
.tab {
  position: relative;
  margin-bottom: 10px;
  width: 100%;
  color: #fff;
  overflow: hidden;
}
input {
  position: absolute;
  opacity: 0;
  z-index: -1;
}
label {
  position: relative;
  display: block;
  padding: 0 0 0 1em;
  background: #16a085;
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