* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body{
    background-color: rgb(213, 213, 221);
    overflow: hidden;
    height: 125vh;
    background-color: black;
}
body.switch_on{
    background-color: white;
}
.navbar {
    display: flex;
    max-height: 4rem;
}

.nav_items {
    width: 100%;
    background-color: cornflowerblue;
    display: flex;
}

.nav_items li {
    list-style: none;
    display: flex;
    justify-content: center;
    align-items: center;
   
    padding: 1.7rem 5rem;
    
}

.nav_items li a {
    text-decoration: none;
    font-weight: bold;
    color: white;
    position: relative;
}

.nav_items li a::before {
    content: "";
    position: absolute;
    width: 0;
    height: 0.2rem;
    left: 0;
    top: 100%;
    background-color: black;
    transition: all 0.6s;
} 

.nav_items li a:hover::before {
    width: 100%;
    background-color: greenyellow;
}

.logo {
    width: 20%;
    display: flex;
    align-items: center;
    justify-content: center;

}

.logo img {
    width: 18%;
    height: 3rem;
    border: 2px solid black;
    border-radius: 200px;

}
.led{
    position: relative;
    width: 80px;
    height: 80px;
    background-color: #444;
    border-radius: 50%;
    margin: 50px;
}
.led::before{
    content: "";
    position: absolute;
    left: 22.5px;
    width: 35px;
    top: -50%;
    height: 80px;
    background: #444;
border-top: 30px solid ;
border-radius: 10px;
}
.button{
position: absolute;
width: 80px;
height: 80px;
background: whitesmoke;
margin: 100px;
border: 2px solid;
display: flex;
justify-content: center;
align-items: center;

}
.button .on{
    position: relative;
    width: 25px;
    height: 35px;
    background: linear-gradient(#151515 ,#ccc,#151515);
    border-radius:5px ;
    border: 2px solid;
    cursor: pointer;

}
.button .on::before{
    content: "";
    position: absolute;
    top: 0;
left: 0;
width: 100%;
height: 85%;
background: linear-gradient(#777 ,#ccc);
/* border-radius:5px ; */

}

.switch_on .button .on::before{
    top: 15%;
    
}
body.switch_on .led::after{
content: "";
position: absolute;
top: 50%;
left:50%;
transform: translate(-50% -50%);
width: 120px;
height: 120px;
background-color: white;
border-radius: 50%;
filter: blur(40px);
}
.para{
    display: flex;
    align-items: center;
    justify-content: center;
    margin-left:300px;
    margin-top: 100px;
    width: 300px;
    height: 100px;
}