body {
    background: linear-gradient(270deg, rgba(63, 94, 251, 1) 0%, rgba(252, 70, 107, 1) 100%);
    background-size: cover;
    background-repeat: no-repeat;
    background-attachment: fixed;
    margin: 0;
}

.container {
    color: black;
    margin: 0 auto;
    width: 600px;
    height: 600px;
    border: 6px solid black;
    box-sizing: content-box;
    background-color: white;
}

.box {
    width: 150px;
    height: 150px;
    box-sizing: border-box;
    border: 6px black;
    background-color: white;
}

.box1 {
    border-right: 6px solid black;
    border-bottom: 6px solid black;
    background-color: blue;
    width: 300px;
    height: 300px;
}

.box2 {
    float: left;
    border-top: 6px solid black;
    border-bottom: 6px solid black;
    border-right: 6px solid black;
    width: 100px;
    background-color: #ff0000;
}

.box3 {
    float: right;
    border-left: 6px solid black;
    border-right: 6px solid black;
    border-top: 6px solid black;
    width: 150px;
    height: 350px;
    background-color: yellow;
    box-sizing: border-box;
}

.box4 {
    float: right;
    width: 50px;
    height: 50px;
    background-color: #bdb76b;
    border-top: 6px solid black;
    border-bottom: 6px solid black;
}

.box5 {
    width: 500px;
    height: 50px;
    border-right: 6px solid black;
    border-top: 6px solid black;
    border-bottom: 6px solid black;
    background-color: #F5DEB3;
}

.box6 {
    width: 150px;
    height: 100px;
    background-color: cadetblue;
    border-right: 6px solid black;
}

.box7 {
    width: 256px;
    height: 100px;
    float: right;
    border-left: 6px solid black;
    border-right: 6px solid black;
    border-top: 6px solid black;
    background-color: orangered;
}

.box8 {
    float: right;
    background-color: purple;
    border-left: 6px solid black;
}

.box9 {
    float: right;
    height: 50px;
    width: 50px;
    background-color: #603631;
    border-top: 6px solid black;
    border-bottom: 6px solid black;
}

.box10 {
    background-color: #9f2b60;
    border-right: 6px solid black;
}

h1 {
    margin: 0 auto;
}

@keyframes rainbow {
    0%   { background-color: #ff0000; }
    14%  { background-color: #ff7f00; }
    28%  { background-color: #ffff00; }
    42%  { background-color: #00ff00; }
    57%  { background-color: #0000ff; }
    71%  { background-color: #4b0082; }
    85%  { background-color: #8b00ff; }
    100% { background-color: #ff0000; }
}

.div {
    width: 60px;
    height: 20px;
    background-color: white;
    animation: rainbow 5s linear infinite;
    margin: 0 auto;
}

.div-center {
    margin: 0 auto;
    width: 620px;
    height: 500px;
    padding: 20px;
    background-color: rgba(0,0,0,0.2);
    border: 2px solid black;
    border-radius: 7px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.5);
    accent-color: #090909;
}

.color-box {
    padding-top: 10px;
    padding-bottom: 20px;
}

h4 {
    margin: 0 auto;
}

.html-fuse {
    margin: 1rem;
    padding: 2rem;
    text-align: center;
}

.html-1 {
    width: 180px;
    height: 180px;
    background-color: white;
    border: 2px solid black;
    border-radius: 7px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.5);
    display: inline-block;
    padding: 1rem;
    vertical-align: middle;
    background-image: url("img-css/fish.jpg");
    background-size: 220px 220px;
}

.html-2 {
    width: 180px;
    height: 180px;
    background-color: white;
    border: 2px solid black;
    border-radius: 7px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.5);
    display: inline-block;
    padding: 1rem;
    vertical-align: middle;
    background-image: url("img-css/allien_cat.png");
    background-size: 220px 220px;
}

.html-1:hover,
.html-2:hover {
    border: 2px solid #984aec;
    box-shadow: 0px 0px 15px 5px rgba(74, 157, 236, 0.2);
    transform: scale(1.2);
    transition: transform 0.3s ease, border 0.3s ease, box-shadow 0.3s ease;
}

.html-1:active,
.html-2:active {
    transform: scale(1.1);
    box-shadow: 0 0 10px 3px rgba(74, 157, 236, 0.4);
    transition: transform 0.1s ease, box-shadow 0.1s ease;
}

.html-1, .html-2, .html-4, .html-5, .html-6 {
    cursor: pointer;
}

h6 {
    color: black;
    font-size: 40px;
    font-weight: normal;
    margin: 0;
    text-align: center;
    line-height: 1;
    font-family: Arial, sans-serif;
}

.html-4 {
    width: 200px;
    height: 200px;
    border-radius: 20%;
    border: 2px solid transparent;
    background-color: lightblue;
    display: flex;
    justify-content: center;
    align-items: center;
}

.html-5 {
    width: 200px;
    height: 200px;
    border-radius: 20%;
    border: 2px solid transparent;
    background-color: violet;
    display: flex;
    justify-content: center;
    align-items: center;
}

.html-6 {
    width: 200px;
    height: 200px;
    border-radius: 20%;
    border: 2px solid transparent;
    background-color: gold;
    display: flex;
    justify-content: center;
    align-items: center;
}

.html-4:hover,
.html-5:hover,
.html-6:hover {
    border: 2px solid #984aec;
    box-shadow: 0px 0px 15px 5px rgba(74, 157, 236, 0.2);
    transform: scale(1.2);
}

.html-4:active,
.html-5:active,
.html-6:active {
    transform: scale(1.1);
    box-shadow: 0 0 10px 3px rgba(74, 157, 236, 0.4);
}