body {
  font-family: Roboto;
  font-size: 18px;
  line-height: 1.5;
  width: 100%;
}

header {
  background-image: url(hero.jpg);
  background-position: center center;
  background-size: cover;
  height: 800px;
}

header h1 {
  max-width: 300px;
}

header nav {
  display: flex;
  justify-content: space-between;
  padding: 25px;
}

header nav a {
  color: #000000;
  text-decoration: none;
}

.about {
  display: flex;
  width: 100%;
}

.guitar {
  align-items: center;
  background-color: #2c9bff;
  display: flex;
  justify-content: center;
  width: 50%;
}

.guitar img {
  padding: 65px;
}

.introduction h2 {
  color: #2c9bff;
  font-size: 32px;
  font-weight: 700;
  line-height: 1.37;
  margin-bottom: 20px;
}

.introduction {
  background-color: #f9dbd7;
  color: #2c9bff;
  padding: 65px;
  width: 50%;
}

.introduction p {
  margin-bottom: 25px;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 20px 30px;
}

.container h3 {
  font-family: Open Sans;
  font-size: 40px;
  font-weight: 700;
  padding-bottom: 20px;
  text-transform: uppercase;
}

.store .container {
  display: flex;
  flex-wrap: wrap;
  padding-bottom: 80px;
}

.store {
  background-color: #ffffff;
}

.product {
  position: relative;
  width: 33%;
}

.overlay {
  position: absolute;
  left: 0;
  top: 0;
  background-color: rgba(44, 155, 255, 0.7);
  width: 100%;
  height: 100%;
  opacity: 0;
}

.overlay:hover {
  opacity: 1;
  transition: opacity 0.5s cubic-bezier(0.42, 0.24, 0, 1.01);
}

.overlay h4,
.overlay p {
  color: white;
  left: 15px;
  position: absolute;
  font-weight: 700;
}

.overlay h4 {
  font-family: Open Sans;
  top: 15px;
}

.overlay p {
  bottom: 15px;
  font-size: 36px;
}

.show-filters {
  display: none;
}

.filters-list li {
  display: inline;
}

.filters a {
  color: #000000;
  margin-right: 20px;
  text-decoration: none;
}

.filters a.selected {
  border-bottom: 2px solid #2c9bff;
  padding-bottom: 5px;
}

footer {
  background-color: #2c9bff;
  display: flex;
}

footer img {
  padding: 15px 20px;
  text-align: center;
  width: 200px;
}

/* tablet */
@media (max-width: 900px) {
  body {
    font-size: 16px;
  }

  header {
    height: 500px;
  }

  header h1 {
    width: 200px;
  }
  
  .guitar img {
    padding: 30px;
  }

  h2,
  h3 {
    font-size: 32px;
    line-height: 1.3;
  }

  .introduction {
    padding: 30px 30px 50px;
  }

  h3 {
    padding-top: 10px;
  }
  
  .product {
  	width: 50%;
	}
}

/*  mobile  */
@media (max-width: 640px) {
  body {
    font-size: 14px;
  }

  header {
    background-size: cover;
    background-position: center;
    height: 250px;
    font-size: 12px;
  }

  header nav a {
    line-height: 2;
  }

  header h1 {
    width: 150px;
  }
  
  .about {
    flex-direction: column-reverse;
  }
  
  .introduction,
  .guitar {
    width: 100%;
  }

  .show-filters {
    color: #cccccc;
    display: block;
    margin-bottom: 20px;
  }
  
  .filters-list {
    display: none;
  }

  .filters-list li {
    display: block;
    margin-bottom: 5px;
  }

  .store .container {
    padding-bottom: 80px;
    display: block;
    padding-top: 10px;
  }

  .product {
    width: 100%;
    margin-bottom: 10px;
  }

  footer img {
    padding: 20px 0;
    margin: 0 auto;
    display: block;
  }
}