html, body, .background {
    height: 100%;
}
.background {
    min-height: 100%;
}
body > .background {
    height: auto;
}
.cancel-float:after {
    content: "";
    display: block;
    clear: both;
}

.btn {
    cursor: pointer;
}
.checkbox-label {
    cursor: pointer;
}
.visible-ie8, .visible-ie9 {
    display: none;
}
.width-50 {
    width: 50%;
}
.width-100 {
    width: 100%;
}

.content-header-1, .content-header-q {
    font-size: medium;
    font-weight: bolder;
    border-bottom-width: 2px;
    border-bottom-style: solid;
}
.content-header-1 {
    border-bottom-color: #90c2cd;
}
.content-header-q {
    border-bottom-color: #e4c8cc;
}
.content-interval {
    margin-top: 50px;
}

/* balloon */
.balloon-left,
.balloon-right {
    position: relative;
    padding: 20px;
    border: 1px solid #000;
    border-radius: 10px;
}
.balloon-left:before, .balloon-left:after,
.balloon-right:before, .balloon-right:after {
    content: '';
    position: absolute;
    width: 0;
    height: 0;
    border: solid transparent;
    border-width: 14px;
}
.balloon-left:before, .balloon-left:after {
    top: 15%;
    left: 100%;
}
.balloon-left:before {
    border-left-color: #000;
}
.balloon-left:after {
    margin-left: -1px;
    border-left-color: #fff;
}
.balloon-right:before, .balloon-right:after {
    top: 15%;
    left: 0%;
}
.balloon-right:before {
    margin-left: -28px;
    border-right-color: #000;
}
.balloon-right:after {
    margin-left: -27px;
    border-right-color: #fff;
}

/* PC向け */
@media (min-width: 991px) {
    .show-mobile {
        display: none;
    }
}
/* モバイル向け */
@media (max-width: 991px) {
    body {
        font-size: small;
    }
    .show-pc {
        display: none;
    }
}