html {
  box-sizing: border-box;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

*,
*:before,
*:after {
  box-sizing: inherit;
}

b {
  font-weight: bold;
}

body {
  width: 700px;
  margin: 0 auto;
  background-color: #111; 
  font-family: 'Source Sans Pro', sans-serif;
  color: #FAFAFA; 
}

.container {
  margin: 2% auto;
  padding: 15px;
  background-color: #1E1E1E; 
  -webkit-box-shadow: 0px 1px 4px 0px rgba(255, 255, 255, 0.2); 
  box-shadow: 0px 1px 4px 0px rgba(255, 255, 255, 0.2); 
}

h1 {
  font-size: 3rem;
  font-weight: 900;
  text-align: center;
  margin: 1% 0 3%;
}

textarea {
  width: 100%;
  height: 250px;
  padding: 10px;
  border: 1px solid #555;
  outline: none;
  font-size: 1rem;
  resize: none;
  line-height: 1.5rem;
  background-color: #333;
  color: #FAFAFA;
}

textarea:hover {
  border-color: #AAA; 
}

textarea:focus {
  border-color: #1d1924; 
}

.output.row {
  width: 100%;
  border: 1px solid #444;
  font-size: 1.4rem;
  margin: 1% 0;
  background-color: #222;
  color: #FAFAFA; 
}

.output.row div {
  display: inline-block;
  width: 42%;
  padding: 10px 15px;
  margin: 1%;
}

.output.row span {
  font-weight: bold;
  font-size: 1.5rem;
}

#readability {
  width: 52%;
  font-weight: bold;
}

#readability:hover {
  background-color: #1d1924;
  color: #FFF;
  border-radius: 2px;
  cursor: pointer;
}

#readability:active {
  background-color: #1d1924;
}

.keywords {
  display: none;
  margin: 4% 0 0;
  font-size: 2rem;
  font-weight: 900;
}

.keywords ul {
  font-weight: 400;
  border: 1px solid #444;
  font-size: 1.4rem;
  background-color: #222;
  margin: 2% 0;
}

.keywords li {
  display: inline-block;
  width: 44%;
  padding: 10px;
  margin: 1%;
}


@media (max-width: 750px) {
  body {
    width: 600px;
  }
  .output.row {
    font-size: 1.2rem;
  }
  .output.row span {
    font-size: 1.3rem;
  }
  .keywords ul {
    font-size: 1.2rem;
  }
}

@media (max-width: 600px) {
  body {
    width: 95%;
  }
  .output.row {
    border: none;
    background-color: #111;
  }
  .output.row div {
    display: block;
    width: 100%;
    padding: 10px 15px;
    margin: 2% auto;
    border: 1px solid #444; 
    font-size: 1.8rem;
    background-color: #222; 
    color: #FAFAFA;
  }
  .output.row span {
    font-size: 2rem;
  }
  #readability {
    width: 100%;
    font-size: 1.6rem;
    font-weight: 400;
  }
  .keywords {
    margin: 10% auto;
  }
  .keywords ul {
    font-weight: 400;
    border: none;
    font-size: 1.8rem;
    background-color: #222;
    margin: 5% 0;
  }
  .keywords li {
    display: block;
    width: 100%;
    padding: 10px;
    margin: 2% auto;
    border: 1px solid #444;
  }
}

#ytb {
  position: absolute;
  height: 70px;
  width: 70px;
  left: calc(50% - 35px);
  bottom: 10px;
  text-align: center;
  line-height: 70px;
  border: 1px solid transparent;
  color: #ffffff;
  font-size: 30px;
  transition: 0.2s;
  background-image: url('./imgs/website.png');
  background-size: cover;
}

#ytb:hover{
border-radius: 100%;
border-color: #ffffff;
box-shadow: 0 0 10px #ffffff;
}