* {
    box-sizing: border-box;
    padding: 0;
    margin: 0;
}

@media screen and (-webkit-min-device-pixel-ratio:0) {
   img {
        fill: none;
        outline: none;
   }
}


body {
    
    
    font-family: 'Yu Gothic', sans-serif;
    padding: 0;
    margin: 0;
}

img {
      user-drag: none; 
      -webkit-user-drag: none; 
      -moz-user-drag: none; 
      fill: none;
      outline: none;
    }

nav {
    display: flex;
    justify-content: center;
    background-color: #124167;
    padding: 5px;
    color: white;
    
}

nav .container div {
    text-align: center;
    padding: 10px;
}

nav .container {
    max-width: 1200px;
    margin: 0 auto;
    font-size: 30px;
    font-weight: 600;
}

.logout {
    font-size: 24px;
}

main .container {
    max-width: 1200px;
    margin: 0 auto;
}

.body-container {
    display: flex;
    flex-direction: column;
    
    
    
}

.card {
    display: flex;
    flex-direction: column;
    background-color: #F6F1F1;
    padding: 40px 15px 20px 15px;
    border: 1px solid #ccc;
    width: 160px;
    height: 210px;
    border-radius: 6px;
    justify-content: flex-start;
    gap: 20px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
    cursor: pointer;
    position: relative;
}

.card:hover {
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}


.content-body {
    display: flex;
    flex-wrap: wrap;
    margin: 20px 5%;
    gap: 30px 20px;
    justify-content: center;
    align-items: center;
    padding: 20px;
    
}

.lesson-num {
    display: flex;
    justify-content: center;
    font-size: 22px;
    font-weight: bold;
    
}

.lesson-topic {
    display: flex;
    justify-content: center;
    font-size: 16px;
    
}

.showrecord {
    position: absolute;
    top: -12px;
    left: -1px;
    z-index: 999;
    display: flex;
    padding: 2px 5px;
    border-radius: 9px 9px 9px 0;
    
}

.showrecord > div:first-child {
    
    border-right: 1px solid white;
}


.showimage {
    position: absolute;
    opacity: .1;
    bottom: 10px;
    right: 10px;
}


.bg_show_record {
    padding: 0 5px;
    
}



.visited_color {
    background-color: rgba(173, 216, 230, .4)

}


.bg_color5 {
    background-color: #D8E6FA;
}

.bgs_color5 {
    background-color: #568EBE;
    color: white;
}

.bg_color10 {
    background-color: #DBECDB;
}

.bgs_color10 {
    background-color: #59A47D;
    color: white;
}


.bg_color15 {
    background-color: #FDE1D5;
}

.bgs_color15 {
    background-color: #E18943;
    color: white;
}

.bg_color20 {
    background-color: #F3E2FB;
}

.bgs_color20 {
    background-color: #86549D;
    color: white;
}

.bg_color25 {
    background-color: #FAF3C7;
}

.bgs_color25 {
    background-color: #D9AE47;
    color: white;
}

.bg_color30 {
    background-color: #D9EEF2;
}

.bgs_color30 {
    background-color: #6FB7BB;
    color: white;
}

.bg_color35 {
    background-color: #F7D8D6;
}

.bgs_color35 {
    background-color: #D8949F;
    color: white;
}

.bg_color40 {
    background-color: #F2C6C1;
}

.bgs_color40 {
    background-color: #B84F43;
    color: white;
}

.bg_color45 {
    background-color: #C8F2E0;
}

.bgs_color45 {
    background-color: #62B49A;
    color: white;
}