*{
    margin: 0;
    padding: 0;
}

body{
    font-family: Arial, Helvetica, sans-serif;
    display: flex;
    justify-content: center;
    padding-top: 30px;
    background-color: #ffffff;
}

.outer-box{
    border: 2px solid #5b87c6;
    padding: 20px;
    width: 600px;
    box-sizing: border-box;
}

h3{
    margin-top: 0;
    margin-bottom: 15px;
    font-size: 22px;
    font-weight: bold;
}

fieldset{
    border: 1px solid #b3b3b3;
    padding: 8px 15px;
    margin-bottom: 15px;
}

legend{
    font-size: 15px;
    color: #333;
    padding: 0 5px;
}

.radio-group label{
    margin-right: 15px;
    font-size: 16px;
    cursor: pointer;
}

.input-row{
    display: flex;
    align-items: center;
    margin-bottom: 10px;
}

.input-row label{
    width: 60px;
    font-size: 16px;
}

.input-row input[type="text"]{
    flex: 1;
    padding: 3px 6px;
    font-size: 15px;
    border: 1px solid #767676;
}

.btn-container{
    margin-left: 10px;
}

button{
    font-size: 15px;
    padding: 3px 12px;
    background-color: #f0f0f0;
    border: 1px solid #767676;
    border-radius: 2px;
    cursor: pointer;
}

button:hover{
    background-color: #e0e0e0;
}

#chart_div{
    width: 100%;
    height: 300px;
    margin-top: 15px;
}