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

html, body {
    height: 100%;
    width: 100%;
}

body {
    background-color: white;
    color: black;
    font-family: system-ui, sans-serif;
}

nav {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    padding: 1rem 0 1rem 2rem ;
    gap: 0.5rem;
    border-bottom: solid 1px #aaa;
    background-color: #eee;
}
nav a {
    display: inline-block;
    min-width: 9rem;
    padding: 0.5rem;
    border-radius: 0.2rem;
    border: solid 1px rgb(22, 22, 22);
    text-align: center;
    text-decoration: none;
    color: #1b1b1b;
}
nav a[aria-current= "page"] {
    color: white;
    background-color: blueviolet;
}

main {
    width: 100%;
    height: 100%; 
    position: relative;  
}

.container {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    width: 540px;
    height: auto;
    padding: 35px;
    background-color: rgb(159, 86, 227);
    border-radius: 30px;
}
#height, #weight {
    width: 150px;
    height: 25px;
    margin-top: 30px;
    padding-left: 10px;
}

#weight-guide {
    /* margin-left: 75px; */
    margin-top: 25px;
}

#weight-guide h3 {
    color: white;
    margin-bottom: 10px;
}

#result {
    font-size: 35px;
    /* margin-left: 90px; */
    margin-top: 30px;
    color: rgb(241, 241, 241);
}

button {
    width: 150px;
    height: 35px;
    /* margin-left: 90px; */
    margin-top: 35px;
    background-color: #fff;
    padding: 1px 30px;
    border-radius: 8px;
    color: #212121;
    text-decoration: none;
    border: 2px solid #212121;
    font-size: 25px;
    cursor: pointer;
}

h1 {
    text-align: center;
    color: white;
}