*{
    margin:0;
    padding:0;
    font-family: sans-serif;
}
.background video{
    width:100%;
    height:100%;
    
   
    object-fit: cover;
    
}
.background{
    width:100%;
    height: 100%;
    
    background-size: cover;
    background-position: center;
    position: relative;
    overflow: hidden;
}
.logo{
    width:100px;
    cursor:pointer;
}
.nav{
    width:85%;
    height:15%;
     margin: auto;
    display: flex;
    align-items: center;
    justify-content: space-between; 
    position:absolute;
    top:15px;
    left:15px;
}
.nav button{
    position: absolute;
    right: -170px;
}
button{
    color: #fbfcfd;
    padding :10px 25px;
    border: 1px solid #fff;
    border-radius: 20px;
    outline:none;
    background: transparent;
    cursor: pointer;
}
.content{
    color: #fbfcfd;
    position: absolute;
    top: 50%;
    left:10%;
    transform: translateY(-50%);
    z-index: 2;
}
h1{
    font-size: 4em;
    margin: 10px 0 30px;
    line-height: 1em;
}
.side-bar{
    width: 55px;
    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-link img{
    width: 30px;
    margin: 5px auto 5px;
    cursor:pointer;
}
.social-link{
    width: 50px;
    text-align: center;
    position: absolute;
    top: 30%;
}
.buble img{
    width: 50px;
    animation: bubble 7s linear infinite;
}
.buble{
    width:100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position:absolute;
    bottom:0;
}

@keyframes bubble{
    0%{
        transform: translateY(0);
        opacity: 0;
    }
    12%{
        transform: translateY(-12.5vh);
        transform: translateX(25px);
        opacity: 1;
    }
    25%{
        transform: translateY(-25vh);
        opacity: 1;
    }
    37%{
        transform: translateY(-37vh);
        
        opacity: 1;
    }
    50%{
        transform: translateY(-50vh);
        
        opacity: 1;
    }
    75%{
        transform: translateY(-75vh);
        opacity: 1;
    }
    100%{
        transform: translateY(-100vh);
        opacity : 0;
    }
}
.buble img:nth-child(1){
    animation-delay: 0s;
}
.buble img:nth-child(2){
    animation-delay: 1.7s;
}
.buble img:nth-child(3){
    animation-delay: 2.3s;
}
.buble img:nth-child(4){
    animation-delay: 3s;
}
.buble img:nth-child(5){
    animation-delay: 1.2s;
}
.buble img:nth-child(6){
    animation-delay: 0.3s;
}
.buble img:nth-child(7){
    animation-delay: 1.5s;
}
.buble img:nth-child(8){
    animation-delay: 2.2s;
}