.containerhead {
    overflow: hidden;
}

#navbar {
    width: 80%;
    display: flex;
    justify-content: flex-end;
    height: auto;
    border: 5px;
    z-index: 4;
    padding-top: 75px;
    flex-grow: 1;
    margin: auto;
    position: fixed;
    margin-left: 7%;
    transition: padding-top 1s;
    transition-property: padding-top;
    transition-duration: 0.4s;
    transition-timing-function: ease-in;
    transition-delay: 0.1s;
}

    #navbar ul {
        padding: 0;
        list-style: none;
        margin: 0;
    }

    #navbar li {
        color: #fff;
        display: inline;
    }

a {
    color: #fff;
    text-decoration: none;
    position: relative;
    font-family: proxima-nova,Helvetica,Arial,sans-serif;
    font-style: normal;
    font-weight: 400;
    font-size: 18px;
    padding-right: 5px;
    padding-left: 5px;
    display: inline-block;
    text-transform: uppercase;
    overflow: hidden;
    transition: 0.2s;
    margin-right: 15px;
    letter-spacing: 3px;
}

    a:hover {
        color: #ffffffb5;
    }

    a span {
        position: absolute;
        display: block;
    }

        a span:nth-child(1) {
            top: 0;
            left: -100%;
            width: 100%;
            height: 3px;
            background: linear-gradient(90deg,transparent, #fff);
        }

#navbar a:hover span:nth-child(1) {
    left: 100%;
    transition: 1s;
}

#navbar a span:nth-child(2) {
    top: -100%;
    right: 0;
    width: 3px;
    height: 100%;
    background: linear-gradient(180deg,transparent, #fff);
}

#navbar a:hover span:nth-child(2) {
    top: 100%;
    transition: 1s;
    transition-delay: 0.25s;
}

#navbar a span:nth-child(3) {
    bottom: 0;
    right: -100%;
    width: 100%;
    height: 3px;
    background: linear-gradient(270deg,transparent, #fff);
}

#navbar a:hover span:nth-child(3) {
    right: 100%;
    transition: 1s;
    transition-delay: 0.5s;
}

#navbar a span:nth-child(4) {
    bottom: -100%;
    left: 0;
    width: 3px;
    height: 100%;
    background: linear-gradient(360deg,transparent, #fff);
}

#navbar a:hover span:nth-child(4) {
    bottom: 100%;
    transition: 1s;
    transition-delay: 0.75s;
}