style.css

*{
    margin: 0;
    padding: 0;
    font-family: Helvetica;
    box-sizing: border-box;
}
.dark-mode{
    background-color: #000;
    color: white;
}
.light-mode{
    background-color: white;
    color: #000;
}
.navigation{
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    overflow: hidden;
    width: 100%;
}
.navigation ul{
    position: relative;
}
.navigation ul li{
    text-align: center;
    list-style: none;
}
.navigation ul li a{
    color: #333;
    text-decoration: none;
    font-size: 3em;
    padding: 5px 20px;
    display: inline-flex;
    font-weight: 700;
    transition: 0.5s;
}
.navigation ul:hover li a{
    color: #0002;
}
.navigation ul li:hover a{
    color: #000;
    
}
.navigation ul li a::before{
    content: '';
    position: absolute;
    top: 50%;
    left: 40%;
    display: flex;
    justify-content: center;
    align-items: center;
    transform: translate(-50%,-50%);
    font-size: 5em;
    color: rgba(0,0,0,0.1);
    border-radius: 50%;
    z-index: -1;
    opacity: 0;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 450px;
    transition: letter-spacing 0.5s,left 0.5s;
}
.navigation ul li a:hover:before{
    content: attr(data-text);
    opacity: 1;
    letter-spacing: 10px;
    left: 50%;
    right: 50%;
    width: 1800px;
    height: 1800px;

}
.navigation ul li:nth-child(6n+1) a::before{
    background: #427565;
}
.navigation ul li:nth-child(6n+2) a::before{
    background: #4a9e83;
}
.navigation ul li:nth-child(6n+3) a::before{
    background: #3a574e;
}
.navigation ul li:nth-child(6n+4) a::before{
    background: #4a9e83;
}
.navigation ul li:nth-child(6n+5) a::before{
    background: #3a574e;
}
.navigation ul li:nth-child(6n+6) a::before{
    background: #ffeaa7;
}
.navigation ul li:nth-child(6n+1) a:hover:before{
    background: #43f0f0;
}
.mouse{
    width: 25px;
    height: 50px;
    border: 2px solid black;
    border-radius: 20px;
    display: flex;
    right: 50px;
    margin-left: 110px;
}
.mouse-wheel{
    display: block;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: black;
    margin: auto;
    animation: move-wheel 1s linear infinite;
}
@keyframes move-wheel{
    0%{
        opacity: 0;
        transform: translateY(-1rem);
    }
    100%{
        opacity: 1;
        transform: translateY(1rem);
    }
}
.login-bg{
    width: 100%;
    height: 100vh;
    background-position: center;
    background-attachment: fixed;
    background-repeat: no-repeat;
    background-size: cover;
    /*background-image: linear-gradient(rgba(0,0,0,0.75),rgba(0,0,0,0.75)),url(media/background.jpg);*/
}
.box{
    width: 500px;
   /*background: linear-gradient(to right top, rgba(55, 196, 214, 0.3),rgba(55,196,214,0.9));*/
    padding: 40px;
    position: absolute;
    box-shadow: #333;
    transform: translate(-50%,-50%);
    top: 50%;
    left: 50%;
    text-align: center;
    background-position: center;
    background-size: cover;
    /*border: 2px solid wheat;*/
}
.box h3{
    font-family: Helvetica;
    color: gray;
    font-weight: 700;
    font-size: 67px;
}
.box p{
    color: gray;
    font-size: 14px;
    font-weight: 400;
}
.box input[type="email"],.box input[type="password"]{
    border: none;
    background: none;
    display: block;
    margin: 20px auto;
    text-align: center;
    border: 4px solid #ffeaa7;
    border-left: 0;
    border-right: 0;
    padding: 14px 10px;
    border-top: 0;
    width: 300px;
    outline: none;
    color: #ffeaa7;
    font-size: 16px;
    transition: 0.25s;
}
.box input[type="email"]:focus,.box input[type="password"]:focus{
    width: 380px;
    border-color: #246b6b;
}
.box input[type="button"]{
    background: #246b6b;
    display: block;
    margin: 20px auto;
    text-align: center;
    border: 2px solid;
    padding: 14px 40px;
    border-radius: 20px;
    outline: none;
    transition: 0.5s;
    color: wheat;
}
.box input[type="button"]:hover{
    background: #ffeaa7;
    border: none;
    color: #246b6b;
    transform: translate(0,-6px);
}
.dark-btn,
button.light-btn
{
    width: 60px;
    height: 5;
    outline: none;
    background: #246b6b;
    border-radius: 6px;
    display: absolute;
    transform: translate(-50%,-50%);
    margin-left: 110px;
    padding: 14px;
}