.menu{
    display: flex;
    flex-direction: column;
    justify-content: start;
    align-items: center;
    position: fixed;
    z-index: 999;
    top: 0;
    left: -40%;
    width: 40%;
    height: 100%;
    background: linear-gradient(to bottom, #fff, #b9b9b9);
    box-shadow: 2px 2px 10px black;
    font-family: verdana;
    font-size: 18px;
    font-weight: bold;
    color: #000;
}

.menu_close{
    height: 35px;
    width: 35px;
    position: absolute;
    top: 1%;
    right: 1%;
    cursor: pointer;
}

.menu ul{
    width: 100%;
    padding: 0;
    margin: 0;
    list-style: none;
    text-align: center;
    margin-top: 10%;
}

.menu ul li{
    margin: 0;
    margin-top: 10px;
    border-bottom: 2px solid #000;
    transition: border-color 1s;
}

.menu ul li a{
    text-decoration: none;
    color: #000;
    transition: color 1s;
}

.menu .menu_logo{
    height: 40%;
    width: 60%;
    position: absolute;
    bottom: 10%;
}

.menu ul li:hover{
    border-color: #ff3131;
}

.menu ul li:hover a{
    color: #ff3131;
}

.menu ul .active{
    color: #ff3131;
    border-color: #ff3131;
}

  @media (max-width: 991px) {
    .menu{
      left: -80%;
      width: 80%;
    }     
}