header {
    background-color: #2e008b;
    color: white;
    padding: 20px;
    text-align: center;
    box-shadow: 0 2px 6px rgba(0,0,0,0.5);
}

header h1 {
    margin: 0;
    font-size: 1.6rem;
}

.hover-underline {
    font-size: 2rem;
    position: relative;
    display: inline-block;
    color: #ffffff;
}

.hover-underline a {
    color: inherit;
    text-decoration: none;
}

.hover-underline::after,
.hover-underline::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    background: linear-gradient(to right, #0015ff, #00ffff);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.hover-underline::after {
    bottom: -5px;
    left: 0;
    transform-origin: right;
}

.hover-underline::before {
    top: -5px;
    left: 0;
    transform-origin: left;
}

.hover-underline:hover::after,
.hover-underline:hover::before {
    transform: scaleX(1);
}


body {
    margin: 0;
    background-color: white;
    font-family: Arial, sans-serif;
}

h3 {
    text-align: center;
    margin: 40px;
}

.container {
    margin: 50px;
    height: 500px;
    width: 500px;
    border: 5px solid black;
    box-sizing: content-box;
}

.box1 {
    box-sizing: border-box;
    width: 500px;
    height: 100px;
    background-color: #68dcff;
}

.box2 {
    box-sizing: border-box;
    width: 200px;
    height: 100px;
    border-top: 6px solid black;
    background-color: orangered;
    border-bottom: 6px solid black;
    float: left;
}

.box3 {
    box-sizing: border-box;
    width: 150px;
    height: 200px;
    border-top: 6px solid black;
    border-left: 6px solid black;
    background-color: yellow;
    float: left;
}

.box4 {
    box-sizing: border-box;
    width: 150px;
    height: 300px;
    border-top: 6px solid black;
    border-left: 6px solid black;
    border-bottom: 6px solid black;
    background-color: royalblue;
    float: right;
}

.box5 {
    box-sizing: border-box;
    width: 200px;
    height: 200px;
    border-top: 6px solid black;
    background-color: rebeccapurple;
    float: left;
}

.box6 {
    box-sizing: border-box;
    width: 50px;
    height: 200px;
    background-color: lawngreen;
    border-right: 6px solid black;
    border-left: 6px solid black;
    border-top: 6px solid black;
    float: left;
}

.box7 {
    box-sizing: border-box;
    width: 50px;
    height: 100px;
    background-color: cyan;
    float: left;
    border-top: 6px solid black;
    border-bottom: 6px solid black;
    border-right: 3px solid black;
}

.box8 {
    box-sizing: border-box;
    width: 50px;
    height: 100px;
    background-color: purple;
    border-left: 3px solid black;
    border-top: 6px solid black;
    border-bottom: 6px solid black;
    float: left;
}

.box9 {
    box-sizing: border-box;
}

.box10 {
    box-sizing: border-box;
}