Implement Google Fonts

/* slightly transparent fallback */
.backdrop-blur {
  background-color: rgba(255, 255, 255, .9);
}

/* if backdrop support: very transparent and blurred */
@supports ((-webkit-backdrop-filter: blur(2em)) or (backdrop-filter: blur(2em))) {
  .backdrop-blur {
    background-color: rgba(255, 255, 255, .5);
    -webkit-backdrop-filter: blur(2em);
    backdrop-filter: blur(2em);
  }
}

body{
    background-image: url("img_tree.gif");
    background-repeat: no-repeat;
    background-attachment: fixed;
}

let hijo = document.querySelector('.hijo');
let etiqueta = document.querySelectorAll('.etiqueta');
//El metodo .getBoundingClientRect() nos da 
//la posicion de un elemento con respecto al viewport(en numeros).
// tomare la posicion constante del elemento .hijo 
const coords = hijo.getBoundingClientRect();
const j = coords.top; // estamos obteniendo la posicion top en numero
const k = coords.left;

// se aplica forEach para obtener posicion de cada movimiento del mouse
etiqueta.forEach(link => {
// se obtiene la posicion del mouse con la funcion  mover(e)
    function mover(e){
// se calcula la posicion top y left del mouse al cual le restamos
// la posicion del elemento "hijo"; resultado: mouse e "hijo" juntos 
	 let m = e.pageY ;
	 let n = e.pageX ;

	 let t = m - j;
	 let l = n - k;
	 hijo.style.top = t + "px"; // agregando px a los numeros
	 hijo.style.left = l + "px";
    };
// mouseover dice que entro en elemento etiqueta
    link.addEventListener("mouseover",() => {
	hijo.classList.add("edd1");// solo agrega un class que le da color red

	 window.addEventListener("mousemove",mover);// agrega el evento junto a la funcion 
    });

    link.addEventListener("mouseleave",() => {// mouseleave dice que salio del elemento etiqueta
	hijo.classList.remove("edd1"); // le quita un class, que le quita color red
	 window.removeEventListener("mousemove", mover);// remuev el evento
    });
});

/* Simples estilos para delimitar los div*/
.box{
width: 300px;
height: 300px;
border: solid 1px black;
}
.etiqueta{
width:100px;
height:100px;
position: absolute;
left:50px;
top:50px;
background: green;
overflow: hidden;
position:relative;
}
.hijo{
position: absolute;
width: 20px;
height: 20px;
border-radius: 50%;
background-color: blue;
transform: scale(0); /*desaparece el elemento hijo*/
}
.edd1{
background-color: red;
transform: scale(1); /*reaparece el elemento hijo con el mause al centro*/
} 

// un ejemplo con html
<div class="box">
  <div class="etiqueta">
  <div class="hijo"></div>
  </div>
</div> 

#banner .slick-dots {
	display: flex;
	position: absolute;
	left: 50%;
	bottom: 30px;
	transform: translateX(-50%);
}

#banner .slick-dots li button {
	font-size: 0;
	width: 16px;
	height: 16px;
	border: 1px solid #fff;
	background: transparent;
	border-radius: 50%;
	margin: 0 5px;
}

#banner .slick-dots li.slick-active button {
	width: 20px;
	height: 20px;
	background: var(--hover);
	border-color: var(--hover);
}

<style>

 .circle:before {
                    content: ' \25CF';
                    font-size: 50px;
                    color: black;
                }
</style>

<span class="circle"></span>

img {
  mask-image: url(‘mask.png’) linear-gradient(-45deg,
                        rgba(0,0,0,1) 20%, rgba(0,0,0,0) 50%);
  mask-image: url(#masking); /*referencing to the element generated and defined in SVG code*/
} 

.text-gradient {
    background: linear-gradient(94.23deg,#5374fa 12.41%,#fd9179 52.55%,#ff6969 89.95%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.border { 
    width: 400px;
    padding: 20px;
    border-top: 10px solid #FFFF00;
    border-bottom:10px solid #FF0000;
    background-image: 
        linear-gradient(#FFFF00, #FF0000),
        linear-gradient(#FFFF00, #FF0000)
    ;
    background-size:10px 100%;
    background-position:0 0, 100% 0;
    background-repeat:no-repeat;
}

/*EX:.container {
    padding: 0 15px;
// 576px window width and more
    @include sm {
        padding: 0 20px;
    }
// 992px window width and more
    @include lg {
        margin-left: auto;
        margin-right: auto;
        max-width: 1100px;
    } */

// Small tablets and large smartphones (landscape view)
$screen-sm-min: 576px;

// Small tablets (portrait view)
$screen-md-min: 768px;

// Tablets and small desktops
$screen-lg-min: 992px;

// Large tablets and desktops
$screen-xl-min: 1200px;


// Small devices
@mixin sm {
   @media (min-width: #{$screen-sm-min}) {
       @content;
   }
}

// Medium devices
@mixin md {
   @media (min-width: #{$screen-md-min}) {
       @content;
   }
}

// Large devices
@mixin lg {
   @media (min-width: #{$screen-lg-min}) {
       @content;
   }
}

// Extra large devices
@mixin xl {
   @media (min-width: #{$screen-xl-min}) {
       @content;
   }
}

 .rotate {

  transform: rotate(-90deg);


  /* Legacy vendor prefixes that you probably don
                                

.box-one {
	width: 100px;
	margin: 0 auto;
}

.box-two {
	width: 100px;
	margin-left: auto;
    margin-right: auto;
}

.truncate {
  width: 250px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

<div class="skt-hero"> <!--Inicia contenedor -->
<div class="columnas z1" style="--backgroundImg: url(https://cdn.thecoolist.com/wp-content/uploads/2016/05/Japanese-Cherry-beautiful-tree.jpg)">1ahola</div>
<div class="columnas z2" style="--backgroundImg: url(https://wallpaperstock.net/wonderful-trees-path-sun-light-wallpapers_47680_1920x1200.jpg)">2a</div>
<div class="columnas z3" style="--backgroundImg: url(https://img.culturacolectiva.com/featured_image/2018/10/04/1538678265674/deforestacion-del-bosque-amazonico-diecisiete-por-ciento.jpg)" >3a</div>
<div class="columnas z4" style="--backgroundImg: url(https://st.depositphotos.com/1012061/4434/i/600/depositphotos_44342021-stock-photo-sun-rays-inside-coconut-palms.jpg)">4a</div>
</div> <!-- Fin del contenedor -->

// css 

body{
z-index: -10:
} /* para asegurar que nadie este por debajo de body*/
.skt-hero {
    position: absolute;
    width: 100vw;
    height: 100vh;
    display: flex;
    background-image: url(https://haciendofotos.com/wp-content/uploads/las-mejores-fotos-de-paisajes-2020.jpg);
    background-size: cover;
}
.skt-hero:hover{
    z-index:-3;
}
.columnas {
    width: 25%;
    height: 100%;
    border: 1px solid gray;
    background-color: transparent;
    position:absolute;
    opacity: 0.05;
    transition: opacity 2s ease;
}
.columnas:hover {
    height: 100%;
    width:100vw;
    background-image: var(--backgroundImg);
    position: ;
    z-index: -1;
    background-size: cover;
    opacity: 1;
}
.z1{
left:0%;
}
.z1:hover{
left:0%;
}
.z2{
left:25%;
}
.z2:hover{
left:0%;
}
.z3{
left:50%;
}
.z3:hover{
left:0%;
}
.z4{
left:75%;
}
.z4:hover{
left:0%;
}

.LikeButton button {
  margin: 1rem;
  transition: all 0.5s ease;
  transform: scale(1);
}

.LikeButton button:hover {
  cursor: pointer;
  transform: scale(1.25);
  filter: brightness(120%);
}

cssbuttons/index.html
​ ​<p>​
​   ​<input​ class=​"button"​ type=​"button"​ value=​"A Button!"​​>​
​   ​<a​ class=​"button"​ href=​"http://pragprog.com"​​>​A Link!​</a>​
​ ​</p>​