* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
html {
    font-size: 62.5%;
}
header {
    display: flex;
    flex-wrap: wrap;
    background-color: #000000;
    padding: 2rem;
    font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
    color: #fff;
    justify-content: space-evenly;
}
body {
    background-color: #000000;
}
h1 {
    display: inline-block;
    font-size: 4.8rem;
}

nav ul li {
    padding-top: 1.5rem;
    font-size: 2rem;
    font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
    display: inline-block;
    justify-content:flex-end;
    margin-left: 2.5rem;
}

/* En el main esta la parte importante de mobile firts */
main {
    display: flex;
    flex-wrap: wrap;
    flex-direction:row;
    justify-content: space-around;
}

div {
    background-color: #fff;
    height: 15rem;
    width: 30rem;
    padding: 2rem;
    border: 1px solid  #fff;
    border-radius: 2rem;
    margin: 3rem;
    opacity: 0.6;
    text-align: center;
    line-height: 0.1rem;
    font-size: 2.5rem;
    font-weight: bold;
    box-shadow: 10px 10px 10px #aaa
}

div:hover {
    opacity: 1.0;
    transform: rotate(-1deg) scale(1.1);
}

.html-git-css {
    background-image: url(./assets/html-css.png);
    background-size:250%;
    background-position:center;
}
.advanced-css {
    background-image: url(./assets/advanced-css.png);
    background-size:200%;
    background-position: center;
}
.javascript {
    background-image: url(./assets/javascript.png);
    background-size:cover;
    background-position: -5rem;
}
.web-apis{
    background-image: url(./assets/web-apis.jpg);
    background-size: cover;
}
.third-party-apis{
    background-image: url(./assets/tailwind.png);
    background-size: 110%;
    background-position: center;
}
.server-side-apis{
    background-image: url(./assets/serverside-api.png);
    background-size: 150%;
    background-position: top;
}
.project1{
    background-image: url(./assets/Project1.png);
    background-size: cover;
}
.node {
    background-image: url(./assets/node.jpg);
    background-size: cover;
}
.oop {
    background-image: url(./assets/oop3.jpg);
    background-size: cover;
}
.express {
    background-image: url(./assets/express.png);
    background-size: cover;
}
.sql{
    background-image: url(./assets/sql.png);
    background-size: cover;
}
.orm {
    background-image: url(./assets/orm.jpg);
    background-size: 100%;
    background-repeat: no-repeat;
    background-position: center;
}
.mvc{
    background-image: url(./assets/mvc.jpg);
    background-size: cover;
}
.project2{
    background-image: url(./assets/Project1.png);
    background-size: cover;
}
.cs{
    background-image: url(./assets/cs.jpg);
    background-size: cover;
}
.nosql{
    background-image: url(./assets/mongo.png);
    background-size: 150%;
    background-position: top;
}
.pwa{
    background-image: url(./assets/pwa.png);
    background-size: cover;
}
.react{
    background-image: url(./assets/react.png);
    background-size: cover;
}
.mern{
    background-image: url(./assets/mern.png);
    background-size: cover;
}
.state{
    background-image: url(./assets/state.png);
    background-size: cover;
}
.project3{
    background-image: url(./assets/Project1.png);
    background-size: cover;
}
.videos {
    background-image: url(./assets/YouTube_full-color_icon_\(2017\).svg.png);
    background-size:30%;
    background-position:center;
    background-repeat: no-repeat;
    background-color: aliceblue;
}

/* Dark mode Switch */
.switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
  }
  
  /* Hide default HTML checkbox */
  .switch input {
    opacity: 0;
    width: 0;
    height: 0;
  }
  
  /* The slider */
  .slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ff0000;
    -webkit-transition: .4s;
    transition: .4s;
  }
  
  .slider:before {
    position: absolute;
    content: "";
    height: 26px;
    width: 26px;
    left: 4px;
    bottom: 4px;
    background-color: rgb(255, 255, 255);
    -webkit-transition: .4s;
    transition: .4s;
  }
  
  input:checked + .slider {
    background-color: rgb(0, 255, 0);
  }
  
  input:focus + .slider {
    box-shadow: 0 0 1px rgb(29, 128, 210);
  }
  
  input:checked + .slider:before {
    -webkit-transform: translateX(26px);
    -ms-transform: translateX(26px);
    transform: translateX(26px);
  }
  
  /* Rounded sliders */
  .slider.round {
    border-radius: 34px;
  }
  
  .slider.round:before {
    border-radius: 50%;
  }
  
  .row {
    margin: 20px;
    display: flex;
  }
  .col {
    margin: 20px;
  }
  /* Dark mode Switch */