* {
    margin: 0px;
    padding: 0px;
    box-sizing: border-box;
}

/* we use dot (.) to target class and
hash (#) to target id... */
#particles-js {
    width: 100%;
    height: 100vh;
    background-image:
        linear-gradient(rgba(0, 0, 0, 0.7),
            rgba(0, 0, 0, 0.7)),
        url("../firstpage.jpg");
    background-position: center;
    background-size: cover;
}

.center-text {
    position: absolute;
    top: 50%;
    left: 38%;
    transform: translate(-50%, -50%);
}

h1 {
    color: white;
    font-family:  'Roboto Mono', monospace;
    font-size: 4.7em;
}
h2{
    font-size: 2em;
}

#btn {
background: #222;
height: 50px;
min-width: 150px;

border: none;
border-radius: 10px;
color: #eee;
font-size: 40px;
font-family: 'Roboto Mono', monospace;
position: relative;
transition: 1s;
-webkit-tap-highlight-color: transparent;
display: flex;
align-items: center;
justify-content: center;
cursor: pointer;
padding-top: 5px;
}

#btn #circle {
width: 5px;
height: 5px;
background: transparent;
border-radius: 50%;
position: absolute;
top: 0;
left: 50%;
overflow: hidden;
transition: 500ms;
}

.noselect {
-webkit-touch-callout: none;
-webkit-user-select: none;
-khtml-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
    user-select: none;
}

#btn:hover {
background: transparent;
}

#btn:hover #circle {
height: 50px;
width: 100px;
left: 0;
border-radius: 0;
border-bottom: 2px solid #eee;
}

#btn a{
text-decoration: none;
}

   #footer{
    position: absolute;
     bottom: 0px;
     width: 100%;
    color: lightblue;

   }

   #footer a{
    color: lightblue ;
    text-decoration: none;
   }



   @media screen and (max-width: 730px) {
            
            h1{
                font-size: 3em;
            }
            
            h2{
                font-size: 1em;
            }

        }
        @media screen and (max-width: 480px) {
            
            h1{
                font-size: 2.8em;
            }
            
            h2{
                font-size: 0.8em;
            }

        }