body {
    font-family: emoji;
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
}

h1 {
    text-align: center;
    margin-bottom: 2rem;
    color: burlywood;
}
.containter{
    border: ridge;
    border-width: 11px;
    padding: 21px;
}

form {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-gap: 1rem;
}

table {
    grid-column: 1 / span 3;
    width: 100%;
}

thead {
    background: aquamarine;
    text-align: center;
    }

tr {
    display: flex;
    justify-content: space-evenly;
}
button {
    grid-column: 1 / span 3;
    margin-top: 1rem;
    border-radius: 76px;
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

button:focus {
    outline: none;
    box-shadow: 0 0 0 2px #4CAF50;
}

input[type="text"],
input[type="number"] {
    padding: 0.5rem;
}

input[type="text"]:focus,
input[type="number"]:focus {
    box-shadow: 0 0 0 2px #4CAF50;
}

input[type="text"]:invalid,
input[type="number"]:invalid {
    border: 1px solid grey;
}

input[type="text"]:valid,
input[type="number"]:valid {
    border: 1px solid #ccc;
}

input[type="text"]:placeholder-shown,
input[type="number"]:placeholder-shown {
    opacity: 0.5;
}

input[type="text"]::placeholder,
input[type="number"]::placeholder {
    color: #ccc;
}

#gpa-result {
    grid-column: 1 / span 3;
    margin-top: 1rem;
    color: #4CAF50;
    text-align: center;
    font-weight: bold;
}
select {
    border: ridge;
    height: -webkit-fill-available;
    width: 73px;
}