/* CSS Rest Rule */
* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

#div-3 {
	background-color: skyblue;
	border: 2px solid black;
	height: 200px;
	width: 200px;
}

#div-4 {
	background-color: aquamarine;
	border: 2px solid black;
	height: 200px;
	width: 200px;
}

#span-3 {
	background-color: gray;
	border: 2px solid black;
    display: block;
}

#span-4 {
	background-color: brown;
	border: 2px solid black;
}

#span-5 {
    background: yellow;
    border: 3px solid black;
    display: inline-block;
    height: 300px;
    width: 300px;
}
#span-6 {
    background: orange;
    border: 3px solid black;
    display: inline-block;
    height: 300px;
    width: 300px
}

#div-5 {
    background-color: pink;
    border: 2px solid black;
    display: inline-block;
    height: 300px;
    width: 300px
}
#div-6 {
    background-color: violet;
    border: 2px solid black;
    display: inline-block;
    height: 300px;
    width: 300px
}
#div-8 {
    background-color: lightcyan;
    border: 2px solid black;
    /* display: none; */
}
#span-7 {
    background-color: lightgreen;
    border: 2px solid black;
    /* display: none; */
}
.box {
    background-color: red;
    border: 1px solid black;
    margin: 5px;
}
.fifty-percent {
    width: 50%;
}
.one-hundred-pixels {
    width: 100px;
}
.parent {
    width: 135px;
    border: 2px solid navy;
}
.fifty-vw {
    width: 50vw;
}
.twenty-five-vh {
    height: 25vh;
}
.one-rem {
    font-size: 1rem;
}
.one-em {
    font-size: 1em;
}
.two-rem {
    font-size: 2rem;
}
.two-em {
    font-size: 2em;
}

/* CSS Background Properties */
.background {
    min-height: 50rem;
    /* content: url(https://c4.wallpaperflare.com/wallpaper/43/1003/707/anime-your-name-kimi-no-na-wa-mitsuha-miyamizu-wallpaper-preview.jpg); */
    background-image: url(https://c4.wallpaperflare.com/wallpaper/43/1003/707/anime-your-name-kimi-no-na-wa-mitsuha-miyamizu-wallpaper-preview.jpg);
    background-repeat: no-repeat;
    background-size: 100%;
    background-position: 10% 40%;
    background-attachment: scroll /*and fixed*/;
}

.bg-title {
    color: white;
    text-align: center;
    font-size: 5em;
    margin: 0;
    line-height: 35rem;
}

.container-bg {
    background-color: rgba(0, 0, 0, .5);
    min-height: 100vh;
}