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

body {
    overflow: visible;
    background-color: rgb(0, 0, 0);
    font-family: Arial, sans-serif; 
}
.container {
    width: 400px;
    height: 480px;
    max-width: 90%; 
    margin: 9% auto; 
    padding-left: 40px;
    padding-right: 40px;
    padding-bottom: 40px;
    padding-top: 40px;
    border: 1px solid #ff1818;
    border-radius: 30px;
    box-shadow: inset 0 0 0.5rem #ff1818, 0 0 5rem 0 #ff1818;
    color: orangered;
}

nav {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    padding: 0.5rem;
    gap: 0.5rem;
    border-bottom: solid 1px #aaa;
    background-color: #eee;
    margin-bottom: 20px;
}

nav a {
    display: inline-block;
    min-width: 9rem;
    padding: 0.5rem;
    border-radius: 0.2rem;
    border: solid 1px rgb(0, 0, 0);
    text-align: center;
    text-decoration: none;
    color: #1b1b1b;
}

.home {
    color: #000;
    background-color: #d4d4d4;
}

nav:hover {
    color: #d4d4d4;
}

#height,
#weight {
    width: 100%; 
    height: 25px;
    margin-top: 5px; 
}
form #myp{
    margin-bottom: 20px;
    color: cyan;
}
#weight-guide {
    margin-left: auto; 
    margin-top: 10px;
}
#weight-guide h3{
    color: rgb(255, 251, 17);
    padding-left: 0;
    text-align: center;
    margin-top: 10%;
    margin-bottom: 10px; 
}
#weight-guide p{
    text-align: center;
}
@keyframes blink {
    0% { opacity: 1; }
    50% { opacity: 0; }
    100% { opacity: 1; }
}

#weight-guide p:nth-of-type(1) {
    animation: blink 1s infinite;
    color: rgb(43, 166, 214); 
}

#weight-guide p:nth-of-type(2) {
    animation: blink 1s infinite 0.5s; 
    color: green; 
}

#weight-guide p:nth-of-type(3) {
    animation: blink 1s infinite 1s; 
    color: darkred;
}

#results {
    font-size: 1rem; 
    margin-left: auto; 
    margin-top: 20px;
    text-align: center;
    color: rgb(151, 0, 0);
    font-weight: bold;
}


button {
    width: 100%; 
    max-width: 200px; 
    height: 50px; 
    margin-top: 25px;
    background-color: #fff;
    padding: 0 20px;
    margin-left: 50px;
    border-radius: 8px;
    color: #212121;
    text-decoration: none;
    border: 2px solid #212121;
    font-size: 1.5rem; 
    margin-top: 0px;
}

h1 {
    padding-left: 19px;
    padding-top: 0px;
    padding-bottom: 29px;
}

h1 span{
    color: rgb(31, 90, 184);
}
h1{
    color: white;
}
.container input[type="text"],
.container input[type="password"] {
    border-bottom: 1px solid #888;
    background-color: #555;
    color: white;
}
button {
    color: white;
    background: linear-gradient(to left, #333, #777);
}
@media screen and (max-width: 768px) {
    .container {
        width: 90%;
        margin: 15% auto;
        margin-top: 40%;

    }
    button{
        margin-left: 0px;
    }
    #weight-guide h3{
        display: inline;
    }

}