.section-carousel {
  width: 100%;
  display: flex;
  margin-top: 80px;
  justify-content: center;
  align-items: center;
}

.slider {
  margin: 0 auto;
  width: 1200px;
  height: 450px;
  overflow: hidden;
}

.slides {
  width: 400%;
  height: 400px;
  display: flex;
}

.slides input {
  display: none;
}

.slide {
  width: 25%;
  position: relative;
  transition: 2s;
}


.manual-navigation {
  position: absolute;
  width: 1200px;
  margin-top: 60px;
  display: flex;
  justify-content: center;
}

.manual-btn {
  border: 2px solid #FFF;
  padding: 5px;
  border-radius: 10px;
  cursor: pointer;
  transition: 1s;
}

.manual-btn:not(:last-child) {
  margin-right: 40px;
}

.manual-btn:hover {
  background-color: #FFF;
}

#radio1:checked ~.first {
  margin-left: 0;
}
#radio2:checked ~.first {
  margin-left: -25%;
}
#radio3:checked ~.first {
  margin-left: -50%;
}
#radio4:checked ~.first {
  margin-left: -75%;
}

.navigation-auto div {
  border: 2px solid #20a6ff;
  padding: 5px;
  border-radius: 10px;
  cursor: pointer;
  transition: 1s;
}

.navigation-auto {
  position: absolute;
  width: 1200px;
  margin-top: 460px;
  display: flex;
  justify-content: center;
}

.navigation-auto div:not(:last-child) {
  margin-right: 40px;
}

#radio1:checked ~.navigation-auto .auto-btn1 {
  background-color: #FFF;
}
#radio2:checked ~.navigation-auto .auto-btn2 {
  background-color: #FFF;
}
#radio3:checked ~.navigation-auto .auto-btn3 {
  background-color: #FFF;
}
#radio4:checked ~.navigation-auto .auto-btn4 {
  background-color: #FFF;
}