.align-center {
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Preloder */

.loader {
    width: 40px;
    height: 40px;
    position: absolute;
    top: 50%;
    left: 50%;
    margin-top: -13px;
    margin-left: -13px;
    border-radius: 60px;
    animation: loader 0.8s linear infinite;
    -webkit-animation: loader 0.8s linear infinite;
}

@keyframes loader {
    0% {
        -webkit-transform: rotate(0deg);
        transform: rotate(0deg);
        border: 4px solid #f44336;
        border-left-color: transparent;
    }
    50% {
        -webkit-transform: rotate(180deg);
        transform: rotate(180deg);
        border: 4px solid #673ab7;
        border-left-color: transparent;
    }
    100% {
        -webkit-transform: rotate(360deg);
        transform: rotate(360deg);
        border: 4px solid #f44336;
        border-left-color: transparent;
    }
}

@-webkit-keyframes loader {
    0% {
        -webkit-transform: rotate(0deg);
        border: 4px solid #f44336;
        border-left-color: transparent;
    }
    50% {
        -webkit-transform: rotate(180deg);
        border: 4px solid #673ab7;
        border-left-color: transparent;
    }
    100% {
        -webkit-transform: rotate(360deg);
        border: 4px solid #f44336;
        border-left-color: transparent;
    }
}