*{
      margin: 0;
      padding: 0;
      font-family: sans-serif
}
.banner{  
    width: 100%;
    height: 500vh;
    background-image: linear-Gradient(rgba(0,0,0,0.75),rgba(0,0,0,0.75)), url(pexels-johannes-plenio-1103970.jpg);
    background-color: rgb(71, 68, 68);
    background-size: cover;
    background-position: center;
}
.navbar{
    width: 85%;
    margin: 0px 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.logo{
    width: 120px;
    cursor: pointer;
}
.navbar ul li{ 
      list-style: none;
      display: inline-block;
      margin: 0 20px;
      position: relative;
    }

    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;
    }


 .navbar ul li a{ 
    text-decoration: none;
    color: white;
    text-transform: uppercase;
 }
.navbar ul li::after{ 
    content: '';
    height: 3px;
    width: 0%;
    background: #009688;
    position: absolute;
    left: 0;
    bottom: -10px;
    transition: 0.5s;
}
.navbar ul li:hover::after{
    width: 100%;

 }
.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;
}
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;
}