* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  background-color: #78b9f7;
  font-family: "Roboto Slab", serif;
  font-optical-sizing: auto;
  font-weight: 400;
  font-style: normal;
  transition: 0.3s ease all;
}
body.dark {
  background: #222;
}
a {
  color: #222;
  text-decoration: none;
  font-weight: 500;
}

nav {
  background: #0b95f1;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 20px;
  border-radius: 5px;
  box-shadow: 10px 10px 20px rgba(170, 170, 170, 0.6);
}
body.dark nav {
  background: #222;
}
body.dark nav a {
  color: #c8c8c8;

  &:hover {
    color: #fefefe;
  }
}
nav .logotipo {
  font-weight: 900;
}
nav .enlaces {
  /* border: 1px solid red; */
  display: flex;
  align-items: center;
}
nav .enlaces a {
  margin-right: 40px;
  &:hover {
    color: #707070;
  }
}

.switch {  /* caja que contiene el sol y la luna/*/
  background: #747474;
  border: none;
  cursor: pointer;
  display: flex;
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 5px;
  font-size: 25px;
  border-radius: 100px;
}
.switch::after{  /*circulo que se pone encima de los iconos*/
  content: "";
  display: block;
  width: 30px;
  height: 30px;
  position: absolute;
  background: #36b0f7;
  top: 0;
  left:0;
  border-radius: 100px;
  /* box-shadow: 0 0 2px 2px rgba(0,0,0,0.5); */
  transform: translateX(0);
  transition: transform 0.3s ease;
  
}
.switch.active{
  background: rgb(255, 253, 251);
  color:black
}
.switch.active::after{
  transform: translateX(35px);
  
}
.switch span{
  /* border:1px solid red; */
    display: flex;
    justify-content: center;
    align-items: center;
    width: 30px;
    height: 30px;
}
.opinion{
    margin-top: 100px;
    text-align: center;
    
}
.opinion .heading{
    font-size: 2.5rem;
    color: #111;
    margin-bottom: 20px;
    
    
}
body.dark .opinion .heading{
    color: #c8c8c8;
    
}
.opinion .row{
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(450px, 3fr));
    gap: 40px
    
}
.opinion .row .columns{
    text-align: center;
    width: 400px;
    box-shadow: 10px 10px 20px rgba(0,0,0,0.2);
    border-radius: 10px;
    margin: auto;
}

body.dark .opinion .row .columns{
    background:#222 ;
    color: #fefefefe
}
.opinion .row .columns img{
    width: 100px;
    border-radius: 50%;
    margin: 10px
}
.opinion .row .columns h3{
    font-size: 1.25rem;
    
}
.opinion .row .columns p{
    /* border: 1px solid red; */
    font-size: 0.94rem;
    padding: 10px;
    text-align: justify;
    
}