style.css

*{
    margin: 0;
    padding: 0;
    font-family: serif;
}
.banner{
    width: 100%;
    height: 100vh;
    background-image: linear-gradient(rgba(0,0,0,0.4),rgba(0,0,0,0.6)),url(https://source.unsplash.com/random/1920x1080/?random);
    background-size: cover;
    background-position: center;
}
.navbar{
    width: 85%;
    margin: auto;
    padding: 35px 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.logo{
    width: 120px;
    cursor: pointer;
    color: rgb(230, 4, 4);
    opacity: 0.6;
}
.navbar ul li{
    list-style: none;
    display: inline-block;
    margin: 0 20px;
    position: relative;
}
.navbar ul li a{
    text-decoration: none;
    color: #ffffff;  /* this is the "color" of the logo but when logo is an image the color doesnt really do anything */
    text-transform: uppercase;
}
.navbar ul li::after{
    content: '';
    position: absolute;
    left: 0;
    bottom: -8px;
    width: 80px;
    height: 3px;
    background: #037267;
    border-radius: 1px;
    transform-origin: right;
    transform: scaleX(0);
    transition: transform .5s;

}
.navbar ul li:hover::after{
    width: 100%;
    transform-origin: left;
    transform: scaleX(1);
    
}
.content{
    width: 100%;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    text-align: center;
    color: #fff;
}
.content h1{
    font-size: 70px;
    margin-top: 80px;
}
.content p{
    margin: 20px auto;
    font-weight: 100;
    line-height: 25px;
}

button{
    width: 200px;
    padding: 15px 0;
    text-align: center;
    margin: 20px 10px;
    border-radius: 25px;
    font-weight: bold;
    border: 2px solid #009688;
    background: transparent;
    color: #fff;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}
span{
    background: #009688;
    height: 100%;
    width: 0;
    border-radius: 25px;
    position: absolute;
    left: 0;
    bottom: 0;
    z-index: -1;
    transition: 0.5s;
}
button:hover span{
    width: 100%;
}
button:hover{
    border: none;
}