main{
    max-width: 1080px;
    margin: 0 auto;
    font-size: 16px;
}

.menu{
    float:right;
    position: relative;
    margin: 15em auto 0 auto;
    background-color: #539ba0;
    width: 180px;
    border-radius: 5px;
    transition: 0.7s border-radius ease-in-out, 0.3s height ease-in-out;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.menu--closed{
    height: 70px;
}

.menu--open{
    height: 400px;
}

.button{
    transition: 0.3s transform ease-in-out, 0.3s opacity ease-in-out;;
    cursor: pointer;
    position: absolute;
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    width: 2em;
    height: 2em;
    left: 27%;
    top: 20px;
    opacity: 1;
}

.button:hover {
    opacity: 0.6;
}

.button span{
    width: 100%;
    height: 4px;
    background-color: #000000;
    border-radius: 0%;
}

.menu--open .button{
    transform-origin: center;
    transform: rotate(90deg);
}

.tools{
    display: flex;
    flex-wrap: wrap;
    flex-direction: column;
    align-items: center;
    height: 60%;
    justify-content: space-between;
    transition: 0.3s margin ease-in-out;
}


.tools .icon{
    transition: 0.2s transform ease-in-out;
}

.tools .icon:hover{
    transform: scale(0.8);
}

.tools--hidden{
    margin-top: 400px;
    z-index: -100;
}

.tools--visible{
    margin-top: 40%;
    z-index: 100;
}