Why I can't get the unordered list

<div class="container">
      <h2>THE PERFECT BALANCE OF PERFORMANCE AND COMFORT</h2>
      <p>We understand that wearability is primary for users. Whether you are - outside, in the woods or at home,our solutions make you
          better at what you do with all-day comfort and versatility.</p>
  </div>
         <section>
          <h2>We give you:</h2>
          <ul>
              <li>something</li>
              <li>something 1</li>
              <li>something 3</li>
              <li>something 4</li>
          </ul>
          </section>

*
{
    margin: 0;
    padding: 0;
    font-family: 'Popins', sans-serif;
}

.header{
    min-height: 100vh;
    width: 100%;
    background-image: linear-gradient(rgba(12, 12, 12, 0.514),
      rgba(83, 83, 83, 0.288)), url(images/korica.jpg);
    
    background-position: center;
    background-size: cover;
    position: relative;   
    display: flex;
    align-items: start;
}

nav{
     display: flex;
    padding: 20px;
    justify-content: space-between;
    align-items: center;
    flex-grow: 1;  
}

.header img{
    padding-top: 2%;
    width: 260px;
}

.nav-links{
     flex: 1;
    text-align: right;
}

.nav-links ul li{
    list-style: none;
    display: inline-block;
    padding: 8px 12px;
    position: relative;
}

.nav-links ul li a{
    color: white;
    text-decoration: none;
    font-size: 18px;
    padding: 2px 4px;
}

nav ul li a:hover{
    color: #e9d66b;
    border-radius: 5px;
    box-shadow: 0 0 5px #ffaf1a,
    0 0 5px #ffb833;
}

nav ul ul{
    position: absolute;
    top: 100px;
    border-top: 2px solid rgb(255,179,71);
    opacity: 0;
    visibility: hidden;
    border-top:none;
}

nav ul li:hover>ul{
    top: 40px;
    opacity: 1;
    visibility: visible;
}

nav ul ul li{
   position: relative;
   margin: 0px;
   width: 150px;
   float: none;
   display: list-item;
   border-bottom: 1px solid rgba(0,0,0,0,.3);
   text-align: left;
}

nav ul ul li:hover ul {
    border-top: none;
    top: 0; 
    left: 100px;
  }
 

.nav-links ul ul ul li a {
    position:  block;
    margin-left: 10px;
    top: 0;
}

.text-box{
    width: 90%;
    color: white;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.text-box h1{
    font-size: 60px;
}

.text-box p{
    margin: 10px 0 40px;
    font-size: 16px;
    font-weight: 500;
    color: white;
    background: rgba(255, 255, 255, 0.096);
    padding: 20px;
    border-radius: 5px;
    border-bottom: 1px solid rgba(255,255,255,0.0996);
    border-right: 1px solid rgba(255,255,255, 0.0996);
    box-shadow: var(--box-shadow);
    
}

.btn{
    display: inline-block;
    text-decoration: none;
    color: white;
    border: 1px solid white;
    padding: 12px 34px;
    font-size: 13px;
    background: transparent;
    position: relative;
    cursor: pointer;
}

.btn:hover{
    border: 1px solid #FF8C00;
    background: #FF8C00;
    transition: 1s;
}



.modes{
    width: 80%;
    margin: auto;
    text-align: center;
    padding-top: 100px;
}

h1{
    font-size: 36px;
    font-weight: 600;
}


.gif-col{
    flex-basis: 50%;
    border-radius: 10px;
    margin-bottom: 30px;
    position: relative;
    overflow: hidden;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.layer h3{
    color: black;
    opacity: 0;
    transition: 0.5s;
}

.layer:hover h3{
    bottom: 49%;
    opacity: 1;
}


p{
    color: #777;
    font-size: 14px;
    font-weight: 300;
    line-height: 22px;
    padding: 10px;
}

.row{
    margin-top: 5%;
    display: flex;
    justify-content: space-between;
}

.modes-col{
    flex-basis: 31%;
    background: #e0be603a;
    border-radius: 10px;
    margin-bottom: 5%;
    padding: 20px 12px;
    box-sizing: border-box;
    transition: 0.5s;
}

h3{
    text-align: center;
    font-weight: 600;
    margin: 10px 0;
}

.modes-col:hover{
    box-shadow: 0 0 20px 0 rgba(0,0,0,0.2);
}

/*div class container*/
.container h2{
    width: 80%;
    margin: auto;
    text-align: center;
    padding-top: 50px;
}

.container p{
    text-align:justify;
    padding-top: 10px;
    font-size: 16px;
    font-weight: 300;


/* i didnt make part here for the last section, because whatever I do, it does not work*/
}

at first I thought the problem was from section, but then I decided to try only the code for the unordered list in a new blank html file where everything turned out as it should. At the moment I think the problem comes from the css file