*{
    margin: 0;
    padding: 0;
}

ul,ol{
    list-style-type: none;
}

a{
    text-decoration-line: none;
    text-decoration: none;
}

header{
    text-transform: uppercase;
    width: 100%;
    position: fixed;
    /*overflow: hidden;*/
    transition: .4s;
    z-index: 999;
}

.content{
    position: absolute;
    top: 55px;
}


.head-nav ul{
    background-color: rgba(0,0,0,.7);
    width: 100%;
    display: flex;
    align-items: center;
    height: 55px;
    justify-content: center;
}

.head-nav ul li{
    width: 135px;
    position: relative;
}

.head-nav ul li a{
    text-align: center;
    display: inline-block;
    width: 100%;
    height: 100%;
    line-height: 55px;
    color: aliceblue;
    -webkit-transition: all .6s;
    -moz-transition: prop .6s;
    -ms-transition: prop .6s;
    -o-transition: prop .6s;
    transition: prop .6s;
}

.head-nav ul li a:hover{
    background-color: aliceblue;
    color: black;
}

.head-nav ul>li>ul{
    display: block;
    width: 100%;
    height: auto;
    max-height: 0;
    position: absolute;
    top: 100%;
    left: 0;
    /*position: fixed;*/
    z-index: 999;
    overflow: hidden;
    transition: .4s ease;
}

.head-nav ul>li:hover>ul{
    max-height: 400%;
}


header:hover{
    /*overflow: visible;*/
}