index.css

.font {
    font: 25px  arial, sans-serif;
    padding-left: 20px;
}

html, body {
    display: flex;
    justify-content: center;
    align-items: center;
    box-sizing: border-box;
}

.topText {
    text-align: left;
    margin-top: 2px;
    margin-left: 10px;
    color: gray;
    font: italic 12px  arial, sans-serif;
}

.boxText {
    font: 15px  arial, sans-serif;
    margin-left: 30px;
}

#boxRightText {
    margin-top: 30px;
}

#graftext {
    margin-left: 20px;
}

.input {
    width: 65px;
    height: 25px; 
    margin-left: 30px;
    margin-bottom: 5px;
}

.boxleft {
    width: 200px;
    height: 180px;
    float:left;
    border: black solid thin;
    box-sizing: border-box;
}

.boxright{
    border-style: solid solid solid none;
    border-width: thin;
    width: 200px;
    height: 180px;
    float:left;
    box-sizing: border-box;
}

.button {
    background: rgba(0, 255, 0, 0.774);
    border-radius: 10px;
    width: 78px;
    height: 38px; 
    text-align: center;
    line-height: 35px;
    justify-content: center;
    border: black solid thin;
    margin-left: 30px;
    cursor: pointer;
    user-select: none; /* Standard */
}

::-webkit-input-placeholder { /* Edge */
    margin-left:10px;
}

:-ms-input-placeholder { /* Internet Explorer 10-11 */
    margin-left:10px;
}

::placeholder {
    margin-left:10px;
}

:required {
    background: red;
}