*{
    margin: 0;
    padding: 0;
    font-family: sans-serif;
}

.banner{
    width: 100%;
    height: 100vh;
    background-image:url(background.jpeg);
    background-size: cover;
    background-position: center;
}
a {
    text-decoration: none;
    color: #fff;
}
.navbar{
width: 85%;
margin: auto;
padding: 35px 0;
display: flex;
align-items: center;
justify-content: space-between;
}
.navbar ul li{
    list-style: none;
    display: inline-block;
    margin: 0 20px;
position: relative;
}
.navbar ul li a {
    color: black;
    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 a:hover:after{
    width: 100%;
}
.navbar ul li a:link{
    text-decoration: none;
}
.content{
    width: 100%;
    position: absolute;
    top: 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 {
    transition: 2s;
width: 200px;
padding: 15px 0;
text-align: center;
margin: 20px 10px;
border-radius: 25px;
font-weight: bold;
border: 2px solid #009688;
background:  #009688;
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{
    background: none;
}
button li a:hover:after{
    width: 100%;
}