.placeholder {
    display: inline-block;
    min-height: 1em;
    vertical-align: middle;
    cursor: wait;
    background-color: currentColor;
    opacity: .5
}

.à .btn::before {
    display: inline-block;
    content: ""
}

.placeholder-xs {
    min-height: .6em
}

.placeholder-sm {
    min-height: .8em
}

.placeholder-lg {
    min-height: 1.2em
}

.placeholder-glow .placeholder {
    -webkit-animation: placeholder-glow 2s ease-in-out infinite;
    animation: placeholder-glow 2s ease-in-out infinite
}

@-webkit-keyframes placeholder-glow {
    50% {
        opacity: .2
    }
}

@keyframes placeholder-glow {
    50% {
        opacity: .2
    }
}

.placeholder-wave {
    -webkit-mask-image: linear-gradient(130deg, #000 55%, rgba(0, 0, 0, 0.8) 75%, #000 95%);
    mask-image: linear-gradient(130deg, #000 55%, rgba(0, 0, 0, 0.8) 75%, #000 95%);
    -webkit-mask-size: 200% 100%;
    mask-size: 200% 100%;
    -webkit-animation: placeholder-wave 2s linear infinite;
    animation: placeholder-wave 2s linear infinite
}

@-webkit-keyframes placeholder-wave {
    100% {
        -webkit-mask-position: -200% 0%;
        mask-position: -200% 0%
    }
}

@keyframes placeholder-wave {
    100% {
        -webkit-mask-position: -200% 0%;
        mask-position: -200% 0%
    }
}