style10.css

:root {
    --offset: 60px;
    --w: 700px;
    --grey: rgb(160, 160, 160);
    --offp: 45px;
    --wh: #fff;
}

.none {
    display: none;
}

.ar {
    font-family: Arial, Helvetica, sans-serif;
    

}

.grey {
    color: var(--grey);
    padding-right: 11px;
}

.grey::after {
    content: "";


}

a{
    color: black;
    text-decoration: none;
}

a:hover{
    color: gray;
}

.bg{
    background-color: var(--wh);
}

body,
html {
    padding: 0;
    margin: 0;
    font-size: 16px;
    scroll-behavior: smooth;
    background-color: white;
}

:root {
    box-sizing: border-box;
}



.link{
    border-bottom: 1px solid black;
    padding: 3px 0;

}
.link:hover{
    color: var(--grey);
    border-bottom: 1px solid var(--grey);
}


nav{
  
    width: 100vw;
    height: 5vh;

    border: .5px solid blue;
    background-color: palegoldenrod;
}

main{
    height: 95vh;
    overflow: scroll;
    width: 100vw;
scroll-behavior: smooth;
    border: 1px solid blue;
    

}

.numbers{
    width: 5vw;
    
    height: 100%;
    overflow: scroll;
position: sticky;
   top: 0;
    float: left;
}


.num, .title {

 height: 2rem;
 font-size: 1rem;
 border: #0000ff .5px solid;
 display: block;
 position: sticky;
 position: sticky;
 top: 0;
 z-index: 99;
float: left;
background-color: white;
}

.content{
    float: left;
    width: 95vw;
}
.num{
    width: 30px;
}

.title{
    width:  120px;
   
}

.box {
    background-color: yellow;
   border: blue .5px solid;
  margin-left: 150px;
    min-height: 100vh;
    float: left;
    font-size: 40px;
    padding-left: 60px;
}

@media screen and (max-width: 700px) {
   .title, .box{
    width: 100%;
   }

   .numbers{
    width: 60px;
 
   }

   .num, .title{
    height: 2rem;
 font-size: 1.5rem;
 
   }
  
   main{
    display: flex;

   }
}