.wallpaper {
  background-image: url(../img/book\ \(1\).jpg);
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  background-attachment: fixed;
  width: 100%;
  height: 90vh;
  display: flex;
  justify-content: center;
  align-items: center;
  margin: auto;
  margin-top: 3.5%;
  z-index: -1;
}

.wallpaper h1 {
  color: #fff;
  opacity: 0.7;
  font-size: 5em;
  border: 5px solid #fff;
  padding-left: 20px;
  padding-right: 20px;
}

.container-about {
  display: flex;
  width: 100%;
  height: 100%;
}

.container-about .nav-bar {
  width: 20%;
  min-height: 100%;
  flex-direction: column;
  box-shadow: inset 10px 0px 20px -10px rgba(0, 0, 0, 0, 5);
  padding-top: 70px;
}

.container-about .nav-bar button {
  border: none;
  background-color: transparent;
  width: 100%;
  outline: none;
}

.container-about .right-text {
  width: 80%;
  display: flex;
  flex-direction: column;
  padding: 70px;
  background-image:
    linear-gradient(rgba(241, 248, 255, 0.99), rgba(244, 248, 255, 0.95)),
    url(../img/1000002998.jpg);
  background-position: center;
  background-size: cover;
}

.container-about .right-text p {
  color: #333;
  line-height: 1.7em;
  text-align: justify;
  margin: none;
  max-width: 100%;
}

.container-about .right-text ul {
  color: #333;
  line-height: 1.7em;
  text-align: justify;
}

.container-about .right-text .title-text {
  width: 100%;
  height: 4vh;
  border-bottom: 2px solid rgb(17, 65, 110);
  display: flex;
  justify-content: center;
  align-items: center;
  font-weight: 900;
  color: rgb(17, 65, 110);
  text-transform: uppercase;
  padding: 5px;
  margin-top: 10px;
}

.saradnici {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
}

.saradnici .sar {
  border: 1px solid rgb(17, 65, 110);
  background-image:
    linear-gradient(rgba(241, 248, 255, 1), rgba(244, 248, 255, 1)),
    url(../img/hands.png);
  background-position: center;
  background-size: cover;
  margin: 10px;
  width: 300px;
  height: 300px;
}

.saradnici .sar:hover {
  background-image:
    linear-gradient(rgba(241, 248, 255, 0.9), rgba(244, 248, 255, 0.8)),
    url(../img/hands.png);
}

@media (max-width: 963px) {
  .wallpaper h1 {
    font-size: 3em;
  }
}

@media (max-width: 777px) {
  .container-about .nav-bar {
    width: 25%;
  }

  .container-about .right-text {
    width: 75%;
    padding: 35px;
  }

  .container-about .right-text p {
    line-height: none;
  }

  .container-about .right-text ul {
    line-height: none;
  }
}

@media (max-width: 610px) {
  .container-about {
    flex-direction: column;
  }

  .container-about .nav-bar {
    min-width: 100%;
  }

  .container-about .right-text {
    min-width: 96.5%;
    padding: 10px;
  }

  .container-about .right-text p {
    width: 90%;
  }
}

@media (max-width: 591px) {
  .wallpaper h1 {
    font-size: 2em;
  }
}