li {
    color: #000000;
    background-color:rgb(221, 221, 221);
    width: 200px;
}
waku1{ 
    box-sizing: border-box;
    text-align: left;
    line-height: 80px;
    font-weight: bold;
    font-size: 25px;
    background-color: rgb(255, 255, 255);
}

waku2{ 
    box-sizing: border-box;
    text-align: left;
    line-height: 50 px;
    font-size: 20px;
    background-color: rgb(255, 255, 255);
}

.box2 {
    height: 30px;
    margin-bottom: 30px;
}

.box3 {
    height: 30px;
    margin-bottom: 100px;
}

.card-img img{
    width:50%;
    height:auto;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --nav-height: 10vh;
    --nav-background: #ccc;
}

nav {
    display: flex;
    padding: 0 50px;
    align-items: center;
    width: 100%;
    height: var(--nav-height);
    background: var(--nav-background);
}

.logo h1 {
    font-size: 20px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 3px;
}

/* nav-links */

.nav-links {
    display: flex;
    height: var(--nav-height);
    align-items: center;
    margin-left: auto;
}

.nav-links li {
    list-style: none;
    margin: 0 15px;
    height: var(--nav-height);
    line-height: var(--nav-height);
    text-align: center;
}

.nav-links li a {
    text-decoration: none;
    color: rgb(0, 0, 0);
    position: relative;
    font-size: 20px;
}

/* menu */

.menu {
    cursor: pointer;
    background: var(--nav-background);
    border: none;
    outline: none;
    display: none;
}

.menu .bar {
    width: 20px;
    height: 2px;
    background: #000;
    border-radius: 5px;
    opacity: 1;
    visibility: visible;
    transition: 0.5s ease;
    transform-origin: left;
}

.menu .bar1 {
    margin-bottom: 5px;
}

.menu .bar3 {
    margin-top: 5px;
}

.menu.toggle .bar1 {
    transform-origin: left;
    transform: rotate(45deg);
}

.menu.toggle .bar2 {
    opacity: 0;
    visibility: hidden;
}

.menu.toggle .bar3 {
    transform-origin: left;
    transform: rotate(-45deg);
}

/* responsive */

@media screen and (max-width: 500px) {
    .nav-links {
         flex-direction: column;
         position: fixed;
         top: 0;
         left: 100%;
         width: 300px;
         height: 100%;
         background: var(--nav-background);
         margin-top: var(--nav-height);
         transition: 0.5s ease-out;
    }
    .nav-links li {
         height: var(--nav-height);
         line-height: var(--nav-height);
         text-align: center;
         width: 100%;
         display: block;
    }
    .menu {
         display: block;
         margin-left: auto;
    }

    .menu.toggle + .nav-links {
         transform: translateX(-100%);
    }
}