*{
    margin: 0;
    padding: 0;
    font-family:Arial, Helvetica, sans-serif, sans-serif;
}
.hero{
    width: 100%;
    height: 100vh;
    background-image: url(images/background.png);
    background-size:cover;
    background-position: center;
    position: relative;
    overflow: hidden;
}
.navbar{
    width: 85%;
    height: 15%;
    margin: auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
button{
    color: #fbfcfd;
    padding: 10px 25px;
    background: transparent;
    border: 1px solid #fff;
    border-radius: 20px;
    outline: none;
    cursor: pointer;
}
.content{
    color: #fbfcfd;
    position: absolute;
    top: 50%;
    left: 8%;
    transform: translateY(-50%);
    z-index: 2;
}

h1{
 font-size: 80px;
 margin: 10px 0 30px;
 line-height: 80px;
}
.side-bar{
    width: 50px;
    height: 100vh;
    background: linear-gradient(#00545d,#000729);
    position: absolute;
    right: 0;
    top: 0;
}
.menu{
    display: block;
    width: 25px;
    margin: 40px auto 0;
    cursor: pointer;
}
.social-links img, .useful-links img{
      width: 45px;
      margin: 5px auto;
      cursor: pointer;
}
.social-links{
    width: 50px;
    text-align: center;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
}
.useful-links{
    width: 50px;
    text-align: center;
    position: absolute;
    bottom: 30px;

}
.bubbles img{
    width: 50px;
    animation: bubble 10s linear infinite;
}
.bubbles{
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-around;
    position: absolute;
    bottom: -70px;
}

@keyframes bubble{
    0%{
        transform: translateY(0);
        opacity: 0;
     }
     50%{
        
        opacity: 1;
     }
     70%{
      
        opacity: 1;
}
     100%{
        transform: translateY(-80vh);
        opacity: 0;
}
}



.bubbles img:nth-child(1){
    animation-delay: 2s;
    width: 25px;    
}
.bubbles img:nth-child(2){
    animation-delay: 1s;    
}
.bubbles img:nth-child(3){
    animation-delay: 3s;
    width: 25px;    
}
.bubbles img:nth-child(4){
    animation-delay: 4.5s;    
}
.bubbles img:nth-child(5){
    animation-delay: 3s;    
}
.bubbles img:nth-child(6){
    width: 20px;
    animation-delay: 6s;    
}
.bubbles img:nth-child(7){
    width: 35px;
    animation-delay: 7s;    
}