.solution{
    background-color: coral;
    margin: 0.5%;
}

.in-box{
    background-color: orange;
    margin: 0.5%;
}
.out-box{
    background-color: greenyellow;
    margin: 0.5%;
}
.acid-data{
    background-color: lemonchiffon;
    margin: 0.5%;
}
.acid-box{
    background-color: yellow;
    margin: 0.5%;
}

.charge{
    width: 25px;
}

.pKa{
    width: 50px;
}

.pKsol{
    width: 50px;
}

.acid-preset-box{
    background-color: coral;
    width: 500px;
}

.acid-preset-table .acid-preset-box{
    background-color: orange;
}

#header-wrap{
    background-color: azure;
}

.header-middle{
    background-color: beige;
}

footer{
    background-color: aqua;
}

#contents{
    background-color: #FFA0A0; 
}

.header-title{
    font-size: 80px;
}

/*ボタン装飾*/
.hide-toggle label {
    padding: 5px;
    font-weight: bold;
    border: solid 2px black;
    cursor :pointer;
}

/*ボタンホバー時*/
.hide-toggle label:hover {
    background: #efefef;
}

/*チェックは見えなくする*/
.hide-toggle input[type="checkbox"] {
    display: none;
}

/*中身を非表示にしておく*/
.hide-toggle .hidden-by-checked {
    height: 0;
    padding: 0;
    overflow: hidden;
    opacity: 0;
    transition: 0.8s;
}

/*クリックで中身表示*/
.hide-toggle input:checked ~ .hidden-by-checked {
    padding: 10px 0;
    height: auto;
    opacity: 1;
}

/*ボタン装飾*/
.hide-toggle2 label {
    padding: 5px;
    font-weight: bold;
    border: solid 2px black;
    cursor :pointer;
}

/*ボタンホバー時*/
.hide-toggle2 label:hover {
    background: #efefef;
}

/*チェックは見えなくする*/
.hide-toggle2 input[type="checkbox"][class="hiding-toggle"] {
    display: none;
}

/*中身を非表示にしておく*/
.hide-toggle2 .hidden-by-checked {
    height: 0;
    padding: 0;
    overflow: hidden;
    opacity: 0;
    transition: 0.8s;
}

/*クリックで中身表示*/
.hide-toggle2 input:checked ~ .hidden-by-checked {
    padding: 10px 0;
    height: auto;
    opacity: 1;
}