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

body {
    font-family: Arial, sans-serif;
    background: url('https://i.ibb.co/JWZs8XyT/escher-background.png') no-repeat center center fixed;
    background-size: cover;
    padding: 20px;
}

.header {
    text-align: center;
    padding: 30px 0;
}

.header h1 {
    font-size: 48px;
    color: #212529;
    font-weight: bold;
    margin: 0;
    text-shadow: -1px -1px 0 #fff, 1px -1px 0 #fff, -1px 1px 0 #fff, 1px 1px 0 #fff;
}

h4 {
    color: #495057;
    margin-bottom: 20px;
    text-shadow: -0.5px -0.5px 0 #fff, 0.5px -0.5px 0 #fff, -0.5px 0.5px 0 #fff, 0.5px 0.5px 0 #fff;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: rgb(240, 226, 216);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.tabs {
    display: flex;
    background: rgb(240, 226, 216);
    border-bottom: 2px solid rgb(201, 190, 182);
}

.tab {
    flex: 1;
    padding: 15px 20px;
    text-decoration: none;
    background: transparent;
    border: none;
    font-size: 16px;
    color: #495057;
    transition: all 0.3s ease;
    position: relative;
    text-align: center;
    display: block;
}

.tab:hover {
    /* background: rgb(240, 226, 216); */
    background: rgb(102, 137, 176);
    /* color: #212529; */
    color: rgb(240, 226, 216);
}

.tab.active {
    background: rgb(240, 226, 216);
    color: rgb(102, 137, 176);
    font-weight: bold;
}

.tab.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: rgb(102, 137, 176);
}

.content {
    padding: 30px;
}

h2 {
    color: #212529;
    margin-bottom: 15px;
}

p {
    color: #212529;
    line-height: 1.6;
    margin-bottom: 15px;
}

.highlight {
    color: rgb(78, 97, 148);
    font-weight: bold;
}

ul {
    margin-left: 20px;
    color: #212529;
}

li {
    margin-bottom: 8px;
}

a {
    color: rgb(102, 137, 176);
    text-decoration: underline;
}

a:hover {
    color: #0056b3;
}