body {
    margin: 0px;
    font-family: Arial;
    min-width: 550px;
}
h1 {
    font-size: 23px;
}

.btns {
    display: flex;
    flex-wrap: wrap;
}

.btn {
    padding: 10px 15px;
    border: 1px #e8e8e8 solid;
    border-radius: 20px;
    margin-right: 20px;
    margin-bottom: 10px;
    color: #000;
    text-decoration: none;
}
.btn > span {
    display: inline-block;
    padding: 10px;
    background-color: #4CAF50;
    background-image: url(../images/checked.svg);
    border-radius: 50px;
    margin: -5px;
    margin-right: 5px;
    background-size: 60%;
    background-position: center;
    background-repeat: no-repeat;
    position: relative;
}
.btn.error:before {
    background-color: red;
}
canvas {
    margin-bottom: 15px;
}
select {
    padding: 10px 15px;
    background: none;
    border: 1px #e8e8e8 solid;
    border-radius: 15px;
    font-size: 15px;
    outline: none;
}
.range-theme-dark .btn, .range-theme-dark select,
.range-theme-bluedisplay .btn, .range-theme-bluedisplay select
{
    color: #fff;
}
.btns-wrapper {
    display: flex;
    margin-bottom: 10px;
    flex-wrap: wrap;
}
.btn > span > span {
    opacity: 0;
    transition: all .25s ease;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translateX(-50%) translateY(-50%) scale(0);
    width: 80%;
    height: 80%;
    background: #233044;
    border-radius: 50%;
}
.btn:not(.active) > span > span {
    opacity: 1;
    transform: translateX(-50%) translateY(-50%) scale(1);
}

.container {
    margin: auto;
    width: 1100px;
    max-width: 100%;
    display: flex;
    flex-wrap: wrap;
}

.col-md-6 {
    padding: 10px;
    width: 50%;
    border-bottom: 1px rgba(255, 255, 255, 0.18) solid;
    margin-bottom: 30px;
    padding-bottom: 50px;
}

.col-md-6:last-child {
    padding-bottom: 0px;
    margin-bottom: 20px;
    border-bottom: 0px
}

* {
    box-sizing: border-box;
}
h1 {
    text-align: center;
}

h1 a {
    color: #59e07d;
}
h2 {
    margin: auto;
    max-width: 500px;
    text-align: center;
    font-size: 13px;
    margin-bottom: 50px;
}
canvas {
    max-width: 100%;
}
@media(max-width: 800px) {
    .col-md-6 {
        display: flex;
        flex-direction: column;
        align-items: center;
        width: 100%;
    }
    body {
        padding: 0px 15px;
    }
}
p.footer-text {
    margin: 0px;
}

footer {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px 10px;
    color: #fff!important;
    background: #03A9F4;
}
.description-wrapper {
    margin-bottom: 20px;
    width: 100%;
}
.center {
    text-align: center;
}