body{
    color: #082B48;
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    line-height: 1.5;
}

img{
    width: 100%;
    height: auto;
}

a{
    text-decoration: none;
    color: #082B48;
}

a:hover{
    opacity: 0.7;
}

.container{
    width: 90%;
    max-width: 980px;
    margin: auto;
}

.clear::after{
    clear: both;
    content: "";
    display: block;
}

.header{
    padding: 20px;
}

.header-left{
    float: left;
}

.header-right{
    float: right;
}

.header-title {
    font-weight: bold;
    font-size: 24px;
}

.header-nav{

}

.header-nav-item{
    float: left;
    margin-left: 50px;
}

.header-nav-item a{
    font-size: 15px;
    font-weight: bold;
    line-height: 36px;
}

.top{
    background-image: url('../img/main-vsual-nontitle.png');
    background-size: cover;
    padding: 80px;
}

.top-title{
    font-size: 48px;
    font-weight: bold;
    text-align: center;
    margin-bottom: 20px;
}

.top-subtitle{
    font-size: 18px;
    text-align: center;
}

.section{
    padding: 60px 0;
}

.section-title{
    font-size: 32px;
    font-weight: bold;
    text-align: center;
    margin-bottom: 40px;
}

.about-left{
    float: left;
    width: 48%;
}

.about-right{
    float: right;
    width: 48%;
}

.course{
    background-color: #e3fcf4;
}

.course-wrapper{
    display: flex;
    justify-content: space-between;
}

.course-item{
    width: 30%;
}

.contact-message{
    text-align: center;
    margin-bottom: 20px;
}

input[type="email"]{
    width: 600px;
    border: 3px solid #d8d8d8;
    font-size: 18px;
    display: block;
    margin: auto;
    padding: 15px;
    border-radius: 999px;
    margin-bottom: 20px;
}

.btn{
    padding: 20px 60px;
    display: inline-block;
    background-color: #082B48;
    color: #fff;
    font-size: 24px;
    font-weight: bold;
    border-radius: 4px;
}

.btn:hover{
    opacity: 0.7;
    cursor: pointer;
}

.btn-register{
    background-color: #ec6d64;
    border: #ec6d64;
    display: block;
    margin: auto;
}

footer{
    background-color: #082B48;
    color: #fff;
    padding: 20px 0;
}

.copyright{
    font-size: 15px;
    float: right;
}

@media only screen and (max-width:767px){
    
    .clear::after{
        content: none;
    }
    .header-left{
        float: none;
    }

    .header-title{
        text-align: center;
    }

    .header-right{
        float: none;
    }
    
    .header-nav{
        display: flex;
        justify-content: space-between;
    }

    .header-nav-item{
        float: none;
        margin: 0;
    }

    .top{
        padding: 120px 0;
    }

    .top-title{
        font-size: 32px;
    }

    .top-subtitle{
        font-size: 14px;
    }

    .section{
        padding: 80px 0;
    }

    .section-title{
        font-size: 24px;
        font-weight: bold;
    }

    .section p{
        font-size: 14px;
    }

    .about-left{
        float: none;
        width: 100%;
        margin-bottom: 20px;
    }

    .about-right{
        float: none;
        width: 100%;
    }
    .course-wrapper{
        flex-wrap: wrap;
    }

    .course-item{
        width: 100%;
        margin-bottom: 20px;
    }

    input[type="email"]{
        width: 100%;
    }

    .copyright{
        font-size: 10px;
        float: none;
        text-align: center;
    }
}