*{
    padding: 0;
    margin: 0;
    font-family: sans-serif;
}
body{
    margin: 0px;
    padding: 0px;
    font-family: "montserrat";
    background-color: white;

}
.zfb{
    text-align: center;
            height: 160px;  
            padding: 30px;
            
}
.zfb{
    transition: all 1s ease-in-out;
    padding: 80px;
    
}

.zfb:hover{
    height: 300px;
    
}

.btn{
    position: absolute;
    top: 265px;
    left: 50%;
    transform: translate(-50%,-50%);
    width: 200px;
    height: 60px;
    line-height: 60px;
    text-align: center;
    color: #fff;
    text-decoration: none;
    background: linear-gradient(90deg,#03a9f4,#f441a5,#ffeb3b,#03a9f4);
    border-radius: 30px;
    background-size: 400%;
    font-size: 23px;
    text-transform: uppercase;
    
}

.btn:hover{
    animation: animate 8s linear infinite;
}

@keyframes animate{
    0%{
        background-position: 0%;
    }
    100%{
        background-position: 100%;
    }
}

.btn::before{
    content: '';
    position: absolute;
    top: -5px;
    left: -5px;
    right: -5px;
    bottom: -5px;
    z-index: -1;
    background:linear-gradient(90deg,#03a9f4,#f441a5,#ffeb3b,#03a9f4); 
    border-radius: 40px;
    background-size: 400%;
    opacity: -1;
    transition: 0.5s;
}

.btn:hover::before{
    filter: blur(8px);
    opacity: .5;
    
}

.box1{
    margin: auto;
    margin-top: 35px;
    border-radius: 30px;
    width: 60%;
    border: 4px black solid;
    height: 100px;
    padding: auto;
}