body {
    font-family: Arial, sans-serif;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

h1, h2 {
    text-align: center;
}

.input-group, .mixture-group, .results, .expected-calculations {
    margin-bottom: 20px;
    background-color: #fff3e0;
    padding: 15px;
    border-radius: 5px;
}

.info-box {
    margin-bottom: 20px;
    background-color: #e3f2fd;
    padding: 15px;
    border-radius: 5px;
    border-left: 4px solid #2196f3;
}

.info-box p {
    margin: 8px 0;
    line-height: 1.5;
    font-size: x-small;
}

label {
    display: inline-block;
    width: 200px;
}

input, select {
    width: 150px;
}

.mixture-params {
    margin-left: 20px;
}

#result {
    font-weight: bold;
    margin-top: 20px;
}