.spinner {
    width: 100%;
    height: 100%;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    /* ちょっと透明 */
    background: rgb(251, 253, 255, 0.9);
    z-index: 9999;
}

.double-bounce1, .double-bounce2 {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: #333;
    opacity: 0.6;
    position: fixed;
    top: 50%;
    left: 50%;
    
    -webkit-animation: sk-bounce 2.0s infinite ease-in-out;
    animation: sk-bounce 2.0s infinite ease-in-out;
}

.double-bounce2 {
    -webkit-animation-delay: -1.0s;
    animation-delay: -1.0s;
}

.double-text {
    position: fixed;
    top: 60%;
    left: 51.5%;
    text-align: center;
    transform: translate(-50%, -50%);
    color: #333;
    font-size: 14px;
    font-weight: bold;
    /* no-wrap */
    white-space: nowrap;
    margin-top: 20px;
}

@-webkit-keyframes sk-bounce {
    0%, 100% { -webkit-transform: scale(0.0) }
    50% { -webkit-transform: scale(1.0) }
}

@keyframes sk-bounce {
    0%, 100% { 
        transform: scale(0.0);
        -webkit-transform: scale(0.0);
    } 50% { 
        transform: scale(1.0);
        -webkit-transform: scale(1.0);
    }
}