:root{
    --primary-color: #007bff;
    --primary-color-hover: #0069d9;

    --secondary-color: #6c757d;
    --secondary-color-hover: #5a6268;

    --success-color: #28a745;
    --success-color-hover: #218838;

    --info-color: #17a2b8;
    --info-color-hover: #138496;

    --warning-color: #ffc107;
    --warning-color-hover: #e0a800;

    --danger-color: #dc3545;
    --danger-color-hover: #c82333;
}

*{
    box-sizing: border-box;
}

body{
    margin: 0;
    padding: 0;
    min-height: 100%;
    height: auto;
    background: #2d2d2d;
}

input[type="button"],
input[type="submit"],
button{
    border: none;
    border-radius: 0.2rem;
    outline: none;
    padding: 0.4rem;
    cursor: pointer;
    margin-right: 0.3rem;
    transition: 0.3s linear;
}

#page{
    width: 60%;
    position: absolute;
    top: 20%;
    left: 50%;
    transform: translate(-50%,-20%);
    background: #fff;
    border-radius: 0.4rem;
}
#page section{
    padding: 1rem;
}

.btn-primary{
    background: var(--primary-color);
    color: #fff;
}
.btn-primary:hover{
    background: var(--primary-color-hover);
}
.btn-success{
    background: var(--success-color);
    color: #fff;
}
.btn-success:hover{
    background: var(--success-color-hover);
}
.btn-danger{
    background: var(--danger-color);
    color: #fff;
}
.btn-danger:hover{
    background: var(--danger-color-hover);
}

.upload-loader{
    display: none;
    width: 2rem;
    height: 2rem;
    border-radius: 50%;
    border: 0.4rem solid #666666;
    border-right-color: #ff6600;
    animation: loader .8s linear infinite;
}

@keyframes loader {
    0%{
        transform: rotate(0deg);
    }
    100%{
        transform: rotate(360deg);
    }
}