.main-con {
  margin: 170px 0;
}
.main-con .col-12 {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}
.main-con .main-head {
  text-align: center;
  font-size: 36px;
  font-weight: 600;
  margin-bottom: 25px;
}
.main-con .con-set-chage {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.main-con .con-set-chage .set-change-block {
  margin-bottom: 15px;
  position: relative;
}
.main-con .con-set-chage .set-change-block:last-child {
  margin-bottom: 0;
}
.main-con .con-set-chage .set-change-block .set-change {
  width: 280px;
  height: 30px;
  background: none;
  outline: none;
  padding: 0 10px;
  appearance: none;
  border-radius: 5px;
  border: 1px solid #d2d2d2;
  font-size: 14px;
}
.main-con .con-set-chage .set-change-block::before,
.main-con .con-set-chage .set-change-block::after {
  content: '';
  display: block;
  height: 1px;
  width: 7px;
  background: #000;
  position: absolute;
  top: 50%;
  right: 10px;
}
.main-con .con-set-chage .set-change-block::before {
  transform: rotate(45deg);
  margin-right: 4.2px;
}
.main-con .con-set-chage .set-change-block::after {
  transform: rotate(-45deg);
}
.main-con .main-btn {
  margin-top: 25px;
}
/* Основной блок переключателя */
.theme-block {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 20px 0;
}

/* Скрытый чекбокс */
.checkbox-theme input {
  display: none;
}

/* Ползунок переключателя */
.checkbox-theme {
  position: relative;
  width: 50px;
  height: 24px;
  display: inline-block;
}

.checkbox-theme .slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  transition: 0.4s;
  border-radius: 24px;
}

.checkbox-theme input:checked + .slider {
  background-color: #4caf50;
}

/* Круглая кнопка внутри ползунка */
.checkbox-theme .slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 0px;
  bottom: 3px;
  background-color: #fff;
  transition: 0.4s;
  border-radius: 50%;
  top: -1px;
}

.checkbox-theme input:checked + .slider:before {
  transform: translateX(16px);
}

@media (max-width: 575px) {
  .main-con .main-head {
    font-size: 28px;
  }
}